Why does this walking tracker behave oddly when switching between Wi-Fi and cellular?

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Hi everyone! I’m running into something odd and I’d love to hear if anyone else has experienced it or found a way around it.

I’ve been using a web-based walking tracker on my iPhone recently. It’s not an app—just a tool I open directly in Safari—and it’s been pretty reliable in helping me keep track of my daily walks. I usually walk in the mornings and evenings, and using a simple browser-based option felt more natural for me than downloading yet another app. I was actually inspired by how lightweight and quick it is to access. I just open it in Safari, start my walk, and the tool immediately begins tracking. It’s been a positive experience overall, and I really enjoy the simplicity of it.

To clarify, a walking tracker in this context is something that runs in your browser and uses your phone’s GPS and motion data to follow your movement in real time. It works similarly to what many people would call a live walking distance measurement app, except it doesn’t require installation. It shows your step count, distance covered, and often your pace while you're actively walking. I really like the idea of being able to walk and see everything live without dealing with app permissions, notifications, or syncing across devices.

Here’s where the issue starts: when I begin a walk while still connected to Wi-Fi—like when I leave the house—the tracker often acts strange as my phone switches from Wi-Fi to LTE. Sometimes it freezes completely and I have to refresh it, other times it just seems to lose some of the walk data or reports inaccurate distances. It doesn’t happen every single time, but often enough that I’ve noticed the pattern.

Oddly, if I start tracking while already on cellular data, it tends to work more smoothly. So now I’m trying to figure out if the handoff between Wi-Fi and cellular is somehow interfering with how Safari keeps the tool active, or maybe how location permissions are handled during that transition. I’ve double-checked all my settings—Safari is allowed to access my location always, Low Data Mode is turned off, and Background App Refresh is enabled for everything it applies to. Still, the issue persists.

Another detail that might be relevant: I usually walk while listening to music through my AirPods. I’ve started wondering if Bluetooth might be playing some role here, or even causing conflicts between data streams somehow. Whenever I’ve had music going, I’ve noticed the tracker seems more likely to hang up or lag as I walk through different coverage areas.

I’ve tried both Safari and Chrome to see if it was a browser-specific thing, but even though Safari performs a little better, both browsers show this behavior in certain conditions—especially when I’m moving from indoors to outdoors. GPS works fine for everything else on my phone, like Maps or Find My, so it feels like the issue is specifically with how the browser handles location updates when the network type changes.

I’d really appreciate if anyone who’s used a web-based walking tracker could chime in. Do you keep the tab open the whole time? Do you start tracking after you’re already outdoors? Is there something obvious I might’ve missed in the iPhone settings that would help the browser maintain more consistent data when moving between networks?
 

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