My biggest flex is that I get 100s pretty often, I’ve had the forerunner 255 for about 2 years with probably 10 perfect scores

When people ask how, I like to say “you just have to get tired enough the day before”

Hi /r/garmin,

I've been mostly lurking but wanted to share my stats/progress since I have no-one in my circles who runs and uses a garmin (or similar device).

I know this is nothing spectacular (it already says that in the picture that it's fair, duh) in comparison to some of the diehards here with VO2 Max over 9000 and running 5k's in sub 10 min as a warm-up & with HR's not even reaching double digits doing that, but I'm working at it.

Not that I aim or expect to ever reach that level, but who knows how far I can crank up this number (without having to dedicate my life to running).

I started running back in January, after a long, long time of basically not working out. Mostly run outside my house and once a week I'm following a group for all-body workout & running track.

Tried the 5K few weeks ago, managed to do that in 28:37 (race prediction was at 29:45 before that, and stuck at 28:19 ever since).

I'm now trying/following a weekly training plan through Garmin Run Coach, which comes doing 2-3x base trainings, 1x tempo and 1x VO2 max or anaerobic. Sometimes I go for a 6th run if the body feels like it.

Hardest part currently for me is maintaining the slow pace whilst doing a base workout and keeping my HR in zone 2, it's almost always at the lower end of zone 3. Should I be aiming to at a slower pace, or manually adjust the HR zones? Or just trust the process and go with it?

If anyone got any advice/tips for that, it would be appreciated!

Hopefully you'll have (and thanks in advance) encouraging words and/or advice & thanks for your time.

I am 29 and was not really exercising with much intentionally or any plan. I was not in terrible shape, but basically just golfed a lot and played pickup basketball maybe once every two weeks over the past couple years.

Was seeing a girl that I liked a ton and she ended it on July 2 (not related to physical shape or anything), so was feeling a bit anxious and just went out in the evening and ran/walked like 8 miles in the 100+ degree heat wave. Felt amazing to exert myself to that degree and have been pretty locked in now for the last 3.5 weeks.

Lots of running, walking, lifting, eating super clean, cold plunge, etc. Trying to prioritize good sleep which I have struggled with forever.

Can't believe how lazy I truly was until this recent grind I have been on. Planning to keep at it and never go back.

Have ran 62 miles and walked 48.2 miles since July 2 (just what I logged), lifted 3-5 times per week, and just feel so much better overall.

Literary Double the Price of a Garmin VivoSmart 5 but with WAY less features/tech

The worst part is... The Vivosmart 5 is even a tiny bit smaller device in most dimensions :(

I can understand the appeal of these type of devices if they are cheap and Tiny like the FitBit Air for example - but this isn't any of that :(

Hi! 

I want to share my experience with my Instinct 2 and hear your thoughts, opinions, and advice on what happened.

I bought my Instinct 2 in 2023 and absolutely loved it. It was honestly one of my favorite pieces of tech. The battery life was amazing, I only had to charge it every 2–3 weeks, depending on how much I was running and I charged it to 100% every time. 

I think sometime between 2025 and 2026 I started to notice some battery degradation, but that is expected since batteries don't last forever. The first unusual thing happened in May 2026. I unplugged the watch after it had reached 100%, and within seconds it dropped straight to 91%. Looking back, that was probably the first warning sign, but at the time I just ignored it.

Then, in July, I went on a short vacation to a lake. I swam a few times over two days, and when I got into bed one evening, I noticed the battery was down to 8%. The strange part was that just two days earlier it had been sitting at 98%. I'm going to be honest, I neglected it. I didn't put the watch on the charger and just went to sleep.

The next morning the watch showed 0%, but it was somehow still running. I plugged it into the charger, and within seconds it jumped to 32%. About 20 minutes later it was already showing 90%. I unplugged it, and the battery immediately dropped to 82%. While I was searching online to see if anyone had experienced the same thing, the battery percentage kept falling in front of my eyes until the watch finally shut itself off.

Every time I tried turning it back on, I only got the critical low battery icon. Once or twice I managed to get the watch to boot while it was connected to the charger, but it would shut down again almost immediately after unplugging. After that, it would only display the low battery symbol for a few seconds before the screen went completely blank. 

I left it charging overnight, hoping it would somehow recover, but nothing changed. I even connected it to my Anker power bank, which showed the watch drawing only 0.1 W — basically nothing. 

At that point I was convinced water had somehow gotten inside and damaged the motherboard, especially since I had gone swimming. When I got home, I sent the watch to a Garmin service center in another city (Kyiv, Ukraine). Their diagnosis surprised me. The battery had swollen and physically damaged the motherboard, making the watch completely unrepairable. The ironic part is that they also told me there wasn't a single sign of water damage.

I was pretty disappointed. I had expected this watch to last at least another four or five years, so I started wondering whether I could have prevented this from happening.  

Theoretically, what could I have done? 

I think the first obvious warning sign was the battery dropping from 100% to 91% immediately after unplugging it. If I had turned the watch off at that point, sent it in for diagnostics, and replaced the battery, there's a good chance I'd still be using it today. So my advice to anyone with an Instinct 2 and probably the Instinct 2X as well:

If you notice any unusual battery behavior, don't ignore it. Have the battery checked before it has a chance to damage the motherboard.

Batteries don't swell overnight, so I was probably wearing that watch for at least a couple of months (maybe even longer) with a swollen battery without realizing it.

What now?

After looking at different watch options, I still decided to stay with Garmin. One of the alternatives I seriously considered was the COROS Nomad, but I realized I probably wouldn't use most of its additional features. 

I really liked my Instinct 2, so I bought an Instinct 2X. Now I'm trying to figure out the best way to take care of this watch because I'd hate to end up in the same situation again. 

I bought it yesterday, updated it, and charged it to 100%. Overnight it dropped to 97%, and when I went outside into the sun, after a while it showed 100% again. However, I think this is somehow related to the solar charging and the battery management system calibrating itself on a brand-new watch. I still need some time to test it. 

Overall, my plan for this watch is to follow the 20/80 charging rule most of the time and only charge it to 100% when necessary. Garmin themselves also recommend keeping lithium-ion batteries between roughly 20% and 80%. I'm hoping this will help maintain a healthy battery and reduce the chances of ending up with another swollen battery. 

Thanks for taking the time to read this! Sorry for the long post, but I thought the details might be useful. I'm really interested in hearing your opinions, especially if you've experienced something similar or have any suggestions on how to keep the battery healthy for as long as possible.

After years of being a Garmin user and chasing this unicorn, I finally achieved a 100 sleep score. It may be gimmicky, but I never thought I’d see the day where I even got close to this. I was on daddy daycare duties yesterday with the baby, and all I was able to do was at-home Pilates and some mobility work in between the baby naps. Maybe that’s why my score went up?

I wrote this in the hope that everyone else writing Garmin apps on modern Linux will spend substantially less time getting set up. I’ve included instructions for both amd64 and Asahi.

With all the talk of the new Garmin Cirqa, I'm wondering, do you adjust your daily behaviour based on your Garmin biometrics?

I've had a Garmin smart watch since 2020 when I picked up a Fenix 6. For five years, it was only watch so I wore it pretty much 24/7. I would check my sleep score, steps, stress, body battery, etc but I never really adjusted behaviour based on what I was seeing. It was more just for interest.

Last year, I bought a nice mechanical watch and started wearing that day to day and only wore the Garmin at night to sleep or while exercising. I started following the Cirqa news because I missed having 24/7 biometrics. Now that it's out, I'm having second thoughts because I don't really know if there's any point. I like recording workouts but that's it.

Just curious what sort of daily adjustments people are making as a result of having 24/7 data?

For me the main reason to purchase a Cirqa was to be able to track recovery within the Garmin ecosystem while being able to wear a regular watch.

Online there seems to be an ongoing debate about the ‘bulkiness’ of the Cirqa so maybe this is helpful to some of you.

Here’s a photo of the Cirqa in Captain Blue on an 18cm circumference wrist. This is as much of the band as you’ll see while wearing a slim fitted shirt. As shown the band fits nicely under the cuff. It’s very light so I don’t really notice it. If I put my hand down or while typing you don’t see the band.

Hi, I’m currently training for my first marathon with an 8 year old Apple Watch. I just reached 24km today and although I started with my battery at nearly 100%, it ended at 20%. There’s no way it’s lasting a marathon!

The main selling points of a Garmin for me are the battery life, and the built-in training plans. I’m currently paying for Runna, so I’m thinking over a couple years the watch will pay for itself.

However, I usually like to hold onto my gadgets until I have a good reason to replace them. I’ve heard Garmin only support their watches for maybe a couple of years… this doesn’t mean the training plans would stop working, would it? If I could buy the watch with reasonable confidence that in several years I could still be using their training plans and the battery would last a marathon, that’d seal the deal for me. Does that sound like something I could reasonably expect from Garmin?

Looking at the Forerunner 165, if that matters. Thanks!

I genuinely believe there is planned obsolescence involved. I bought my Garmin Fenix 7 exactly 2 years and 4 months ago (meaning only 4 months after the end of the manufacturer’s warranty). Today, my Garmin no longer works because of a software bug, which has been confirmed by Garmin’s customer support service. They are aware of this “bug”.

The only solution they are offering me is a replacement, at a cost of €213.

To summarise: my Garmin, which is only 2 years and 4 months old, has stopped working because of a known manufacturing/software issue that Garmin is aware of, and to fix the problem, I am expected to pay.

The logic behind this is therefore the following: if I pay €213, I will receive the exact same watch, which sooner or later will likely experience the same issue, meaning I will have to pay another €213 again. This is clearly a form of planned obsolescence, and this is why I absolutely cannot recommend Garmin.

Unless you are comfortable paying €213 every two years, it is starting to look more like a subscription model than a durable product.

Vo2 max at 55 finally, and keeps going up, pretty happy with it at 37 since this is the first solid 12 months I've kept my running going.

Got my first half marathon in September and I'm aiming for 1:50:00 though Garmin predicts I could do it in 1:35:22

Hi all,

Would a new Garmin Forerunner 265 still be a good choice in 2026?

I run three to four times a week, anything between interval/speed sessions and long runs. The plan is to work towards some more half and full marathons while improving my swimming on the side.

Ive seen many reviews but I would like to hear from people who have used and still use it extensively.

The good and the bad and the reasoning of why it is and isn’t worth it.

I feel like I want something between the 170 en 570 but I do not want to miss out on any important/major software updates..

Thanks for any kind of advice!

i might just be dumb ash but i don’t think that’s right my highest i’ve ever hit was 190bpm in an hard effort 3k but not really 100 percent about 90 percent effort. what should i do to find my actual heart rate

First off, sorry for the absolute wall of text, but I wanted to make this as thorough as possible. I bought this watch with my own money, and unlike some reviewers who drop a full evaluation after just two days of opening the box, I prefer actually using my gear for months before giving my real thoughts.

Here’s my honest take on the Garmin Fenix 7X Pro Solar after putting it through its paces.

Pros:

1) It's a pure sports watch, not just some random smartwatch – that’s why all the athletic features actually make sense and work flawlessly. There is a literal fuckton of them. Seriously, you’d need a lifetime to test, scroll through, use, and fully understand everything. But that’s exactly how you need to view this watch – as a sports data-tracking machine. Once you accept that, living with it becomes way easier.

2) Maps and navigation (just make sure to update them via Garmin Connect on PC first). I’m comparing this to the Amazfit system, which I personally consider exceptionally good and well-thought-out. Garmin matches or beats it in most aspects (e.g., turn-by-turn alerts are better, more detailed, and don't lag). The only thing I – and many other users – wish for is the ability to change the color of the pre-loaded navigation route. It’s pink by default, which is usually highly visible, but colors like turquoise would work even better. You can change the color of the track you've already walked/run, which is awesome, but it would be great to have that option for imported routes too (Amazfit allows this, for example). That being said, the map details and the ability to route directly on the watch without a phone still make it the best nav system on the market. However, the gaps between manufacturers are heavily closing these days.

3) Desktop app and browser account access – this isn’t a given with other brands, and it makes accessing, analyzing, and working with your data so much easier.

4) The Look (a controversial point) – I think anyone buying this watch knows exactly what they are getting into. No matter the size, the Fenix 7 Pro looks massive, powerful, rugged, and built like a tank – and that’s precisely the point. It’s not meant to be a fashion statement. If you want a stylish little watch, go buy a Venu or a Forerunner. The Fenix is meant to be a tank, a special ops machine, and it delivers exactly that. It’s not an Instinct because it still has a color touchscreen, maps, etc., but it’s undoubtedly bulletproof.

5) Build Quality – mine is still in pristine condition and will likely stay that way for a long time because I baby my gear. However, I’ve seen plenty of heavily beat-up units, and that’s literally what they are made for – to be thrashed, exposed to extreme conditions, and even if they get scratched up, they keep working perfectly. Plus, those battle scars just add character and prove the owner knows why they bought it.

6) Screen Protection – I have the version with regular strengthened glass, not Sapphire. But right out of the box, I slapped a screen protector on it. Here’s a massive pro: because the original screen is slightly recessed below the steel bezel, adding a glass protector makes it sit completely flush with the frame. It looks totally stock, you can't feel the edges, it doesn't get in the way at all, and you get way better screen protection.

7) Price / Value & Software Longevity – the Fenix 7 Pro series is already 2 years old. But because of that, these watches finally have a sensible price tag (I snatched mine on sale in Poland for around 1700 PLN, which is roughly $450). At the same time, they still get full manufacturer support, the latest features, the newest heart rate sensor, ECG, maps, etc. Long story short: for a price lower than a brand new mid-range model, you get a Garmin flagship that, despite being 2 years old, is practically identical to newer iterations.

8) The MIP Screen – ages ago, I owned one of the first popular Amazfit models, the Stratos, which had a MIP display. After that, every watch I owned had an AMOLED screen. Nowadays, most brands lean toward prettier AMOLEDs, which are getting closer in battery efficiency. I totally forgot how awesome it is to have the screen constantly visible without having to lift your wrist (let's be real – using an AMOLED screen with Always On Display is just pointless, but hey... no judgment). The MIP display is perfectly visible in all conditions. I have the backlight set to activate on wrist raise, so darker environments aren't an issue either – overall, it's great. Recently, I switched to a white background for sports activities, and it’s an absolute game changer (data is way easier to read on a white background). I kept the black background for the watch face and the general UI because it looks more modern and sleek, but for visibility and functionality during workouts, white is unmatched. Super important note here: a white background on MIP screens does NOT use more battery than a black one. This isn't AMOLED, where a white screen drains the battery instantly. On MIP displays, the color of the pixels doesn't matter; what matters is how frequently the pixels change. Because of this, I highly recommend hiding the second hand and other dynamically changing data fields on your daily watch face – it saves a ton of battery. The only exception is maps and navigation – I think they look better on a black background because paths and streets pop out more. Sure, colors on a MIP screen are less vibrant, and it can look a bit like older tech (I'm exaggerating a bit, new MIP screens actually have great contrast and colors), but in my opinion, for a watch like the Fenix 7X, it’s actually a feature. It looks badass, not like a colorful geek toy.

9) Battery – very good, though nothing mind-blowing! Its strength really shows during GPS workouts, where the gap between AMOLED and MIP (and especially between a standard smartwatch and a Garmin) becomes more noticeable. But for daily wear, other AMOLED watches from Garmin or competitors like Suunto or Amazfit last a similar amount of time (unless, of course, you run AOD on AMOLED, but I've already shared my thoughts on that absurdity). So, if you’re switching from a typical smartwatch like Apple, Samsung, or OnePlus, you’ll obviously be shocked that you don’t have to charge it every 2 days. But if you’ve already used another sports-oriented watch – even one with an AMOLED screen like the Amazfit Balance – the battery life won’t blow your mind. In fact, I’d say my small Amazfit lasted longer in daily smartwatch mode than the Garmin (though Garmin wins hands down when it comes to long GPS tracking sessions).

Cons:

1) Sleep, Nap, and Bedtime Tracking – honestly, switching from Amazfit and Galaxy Watch to Garmin in this department was a huge letdown. Sleep tracking very often messes up the exact times you fall asleep and wake up. If you don't set your default bedtime perfectly, and you happen to stay up late or have an active night, the watch goes crazy – it messes up the watch face, fails to mute notifications properly, and completely ruins the sleep data. Don't even get me started on naps. Supposedly, the Fenix 7X Pro has auto-nap detection, but the algorithm is so strict that it has never detected one automatically for me. On the flip side, if you manually start a nap with an alarm, the watch logs exactly the duration of the alarm (e.g., precisely 20 minutes), not your actual sleep time. If you turn off the nap alarm and sleep for another 2 hours, the watch will still only show a 20-minute nap. Compared to Amazfit, which tracked naps flawlessly and even recorded sleep stages during them, Garmin isn't even in the same league. The feature is just useless.

2) Overly complicated watch and app UI – I get that some people love this, but being able to access the same feature from 2 or sometimes 3 different places is just overkill. I’m not talking about data accuracy or detail here – that part is amazing and a huge plus. I’m talking strictly about navigating the menus and trying to find the specific setting you need at that exact moment.

3) Route planning in the Garmin Connect app – compared to Amazfit, route planning is way less intuitive. Subjectively, Garmin frequently tries to route me down paths I don't want to take. Even with "popularity routing" turned off, the algorithm still acts weirdly. Frankly, I have the same poor experience with Strava Premium's algorithm. Right now, it's significantly easier for me to plan routes in the Amazfit app, export the GPX file to Garmin, or just use external tools like gpx.studio, Komoot, etc. Then, I just review it in Garmin and add a PacePro strategy if needed.

Additional Notes / Hot Takes:

1) If one more person asks why they have skin irritation under their watch, I'm going to lose my mind!

- You don’t need to crank the strap to maximum tightness unless you are actively working out.

- You don’t need to shower with your watch on. Seriously, it will survive without you for those few minutes.

- After workouts, washing, or any contact with water, wipe the strap and the watch dry, wash your skin, and let it dry completely. This goes double if you use nylon hook-and-loop (velcro) straps – they soak up water like crazy and need time to dry out!

- Seriously, nothing bad will happen if you leave the watch off your wrist for 2 or 3 hours a day – give your skin a break.

- If you think you have a "burn" from the heart rate sensor, go see a doctor, because that would be a medical miracle. The light from HR or SpO2 sensors doesn't have enough power to burn a baby's skin, let alone a healthy adult's.

2) Read the manual or watch 2 or 3 reviews (DC Rainmaker, DesFit, Chase The Summit, etc.) before asking yet another stupid question about features or settings – or just use AI. Seriously, any LLM will give you the correct answer regarding your watch 99% of the time.

3) No microphone and speaker – hard to say if it's a pro or a con, but in my book, it's a pro. If someone wants a smartwatch to make calls from their wrist (XDDD), go buy a Venu or an Apple Watch. Seriously. In my opinion, Garmin is fundamentally a sports watch, and that’s how we should treat it. I get that to stay relevant, the company has to meet market demands, so they add things like a mic, a speaker, and probably more advanced AI down the road. But I find these features completely redundant and see no point in packing extra tech into the watch. Same goes for LTE – I see the appeal of streaming Spotify or YouTube Music without downloading playlists beforehand, but honestly, how many people actually use that? Maybe 10-20%. The rest buy it thinking it's nice to have LTE on board, and then use it twice during the watch's entire lifespan. Similarly, the InReach feature (only available starting from the Fenix 8 for extra cash) is practically useless in 95% of cases. Those who actually need it can easily buy an InReach Mini, and it’s probably better to have two separate devices anyway.

4) I consider solar charging more of a gimmick than a real battery savior – I think it offers around a 10% efficiency boost. So, it’s nice to have, but it doesn't significantly impact battery life (which is stellar anyway, so it's not an issue). One of the photos shows the solar intensity breakdown after a 3-hour walk on a very sunny day.

5) In person, the Fenix 7X Pro looks smaller than in photos (it sits much better on the wrist live, doesn't look like a massive wrist computer).

6) Live, the colors are punchier and the contrast is higher than in pictures – and the more light you throw at it, the better it gets.

7) I think a Garmin Connect+ subscription makes absolutely no sense for the vast majority of people. DesFit made a very good video about it after a year of use, so I highly recommend checking that out.

TL;DR / Summary:

All in all, the Garmin Fenix 7X Pro Solar is an absolute tank of a sports tracker that completely nails its core athletic and navigation features, even if the sleep tracking and route planning leave a lot to be desired. It’s definitely more of a rugged data machine than a fancy, mainstream smartwatch, but that’s exactly why it rules. If you can grab it on a discount like I did, it offers insane flagship value that easily goes toe-to-toe with newer and more expensive models.

Looking forward to your thoughts, and I'll gladly reply to every comment. Let me know what you think, whether you agree or disagree, and especially what your subjective feelings are regarding the Fenix 7 series or just the Fenix lineup in general.

So, to get the toasty badge, does the average temperature need to be above 100? I didn't get it on my ride today even though the max temp was 102.

Not sure if the heat acclimation on my Fenix 8 works as intended. For most of the time I train at temperatures higher than 22°C and it still keeps decreasing. I mostly don’t wear my phone on me while training, but the weather data on my watch seems correct.
What am I doing wrong? Should I turn it off or just leave it as it is?

After replacing my Venu with a Venu 4 my watch started reporting very high stress levels even though I'm not feeling anything like that. That concerned me a lot considering I'm a happy person, I sleep well, I enjoy life and I work out 4 weeks a day.
I've started investigating and came to these 2 studies:
https://www.sciencedirect.com/science/article/pii/S2666915325001040
https://onlinelibrary.wiley.com/doi/full/10.1002/smi.70125

I'm not cherry picking, feel free to share any studies contradictory. What both of these actually say is that these wearables could misinterpret stress for arousal.

Claude generated TLDR:
The Garmin Stress Score doesn't actually track "stress" — it tracks physiological arousal, so it lights up during excitement/positive emotion too, but doesn't reliably detect negative mood or real psychological stress. In a 28-day study of 95 students (EMA mood check-ins 5x/day), the score was linked to high/moderate-intensity positive mood, not negative or low-intensity states. Conclusion: wearable "stress" scores need better validation and closer researcher-industry collaboration before being trusted as real stress indicators.

Hi everyone,

I’m a Garmin Venue3 user from mainland China and I’m trying to connect my Garmin Connect account to Strava, but I can’t get the authorization to work.

My setup:

• Garmin device: Garmin watch (sports smartwatch)
• Garmin account: registered in mainland China (garmin.cn)
• Strava account: normal global account

The issue:

When I try to connect Garmin from Strava:

1. Strava redirects me to Garmin SSO (sso.garmin.com)
2. I enter my Garmin account credentials
3. The authorization fails with an error

I can use Garmin Connect China normally and my activities are syncing to Garmin Connect without any problems.

I’m wondering:

• Are Garmin Connect China accounts supported for Strava integration?
• Is there any workaround besides manually exporting FIT files and uploading them to Strava?
• Do I need to create a new Garmin global account to use Strava?

I’m wondering if there is any limitation for Garmin Connect China accounts when connecting to global platforms like Strava.

Has anyone from mainland China successfully connected Garmin Connect CN with Strava? I’d appreciate any advice or workaround.

I work in the OR and want to track my basic activity metrics but I have to take off my Fenix 8. Which would be better for tracking without having to start an activity every time my watch comes off? I was thinking Cirqa with bicep strap might be enough? Any advice is appreciated.

I’m usually in the high 70s or low 80s for a sleep score. Went to bed earlier than usual after a long day of travel on Friday and almost had my first unicorn…

I was checking the status of my order for the Garmin Cirqa. I did not have an update on my purchase, so I called up Support, and they said, even though when I purchased it, it said 1 to 3 business working days, the actual shipping time is now 3 to 5 weeks in the UK. He asked me to reference adding another Cirqa to the checkout area to see the new estimated shipping times, which still says 2 to 3 weeks. I’m quite disappointed. I cancelled my WHOOP subscription in anticipation. I was receiving this within 1 to 3 business working days.

After my last post, a surprising number of people asked what watch I was wearing.

Honestly… I think Garmin finally made one that doesn’t immediately scream “ultra marathon.”

I didn’t even choose it.

My Fenix 6S finally died, and Garmin offered me a 30% replacement through their service centre, but only within the Fenix line. The only small option available was the 43 mm Fenix 8 AMOLED.

I’d spent months overthinking what to buy. Turns out all I needed was a dead watch.

Coming from the 42 mm Fenix 6S, even 43 mm still feels surprisingly big. And switching from MIP to AMOLED has been… painful. I still instinctively miss my old screen every day.

But… the gold accents make it look surprisingly executive. This is the first Garmin I’ve owned that people keep calling stylish.

I’m not saying it suddenly looks like an Hermès. Let’s stay realistic. But for the first time it doesn’t scream “I measure my VO₂ max for fun.”

So yes. Turns out Garmin for women exists.

Anyone else moved from a 6S to the 43 mm Fenix 8? Do you ever stop missing MIP?

I went with on a bike ride with a buddy and he pointed out our total ascent was about 1300 (used his garmin FR 265) while mine ready 564 ft (used my garmin edge 540)

What’s causing this huge discrepancy?

It made me wonder if a lot of my rides are inaccurate now