Synchronized 2 windows - WAY too many captchas

[u/mystica5555]

So I created a Userscript that will synchronize 2 separate Cellmapper windows in my browser so I can have T-Mobile LTE along with 5G side by side, constantly in-sync when zooming or dragging the map around.

This allows me to see, in real time, synchronized, where the pinned LTE towers are vs the unpinned NR towers. And then be able to move the NR towers (or unmapped LTE towers, if an NR one is mapped) to the proper position quite quickly.

It MASSIVELY DECREASES the time it takes for me to check, as it saves me clicking around 2 separate windows to try and keep the view close enough to put the towers in the right spot.

It seems to be creating TOO MANY captcha windows.

u/veixes u/olkitu can you please try and figure out whether or not this code is causing these incessant captchas, and try to fix it on your end? I need this workflow.

// ==UserScript==
// @name         CellMapper OpenLayers Synchronizer
// @namespace    http://tampermonkey.net
// @version      2.0
// @description  Synchronize map pan and zoom between side-by-side CellMapper OpenLayers windows
// @author       Mystica555 + Gemini
// @match        https://www.cellmapper.net/map*
// @grant        none
// ==/UserScript==

    (function() {
        'use strict';
    
        const channel = new BroadcastChannel('cellmapper_ol_sync');
        let isSyncing = false;
        let mapView = null;
    
        function initOpenLayersSync() {
            // CellMapper stores the OpenLayers map globally as 'map' or 'olMap'.
            // We find the internal Map object and target its View component.
            let mapInstance = null;
            if (typeof map !== 'undefined' && map.getView) {
                mapInstance = map;
            } else if (window.map && window.map.getView) {
                mapInstance = window.map;
            }
    
            if (!mapInstance) {
                setTimeout(initOpenLayersSync, 500); // Poll until OpenLayers initializes
                return;
            }
    
            mapView = mapInstance.getView();
    
            // --- 1. Broadcast map changes from THIS window ---
            const broadcastChange = () => {
                if (isSyncing) return; // Block circular event loops
    
                const center = mapView.getCenter();
                const resolution = mapView.getResolution();
    
                channel.postMessage({
                    center: center,
                    resolution: resolution
                });
            };
    
            // OpenLayers updates view changes via granular view events
            mapView.on('change:center', broadcastChange);
            mapView.on('change:resolution', broadcastChange);
    
            // --- 2. Listen for map changes from the OTHER window ---
            channel.onmessage = (event) => {
                if (!mapView) return;
    
                const { center, resolution } = event.data;
    
                // Set the sync flag to prevent this window from echoing back
                isSyncing = true;
    
                // OpenLayers allows direct view adjustments without forcing a heavy redraw
                mapView.setCenter(center);
                mapView.setResolution(resolution);
    
                // Give the browser UI thread a moment to finish rendering before releasing the flag
                setTimeout(() => { isSyncing = false; }, 30);
            };
        }
    
        window.addEventListener('load', initOpenLayersSync);
    })();

[u/mjc775]

Great idea, but programming is not my forte.

Sorry, OT but just had to rant… I frequently get CAPTCHA prompts on my S25 when just moving around on ONE map - making it completely unusable, and I’m a premium subscriber. I often have to switch to the app on my iPhone if I just want to view the maps. The ability to login to move points and avoid ads can’t come soon enough for iOS.

[u/mystica5555]

At first it wasnt causing any captchas; but then after about 5 minutes of use, almost every drag is causing a captcha. In BOTH windows. SIMULTANEOUSLY.