How's the range on BLE? I was looking at this app for exactly the use case you mentioned but was curious if it worked with varying distances on bike rides
It's somewhat device dependant - but between her Pixel 6 and my Pixel 7 - if we've got line of sight and the handset's not being held to our body (so in a handlebar mount or saddle bag) - 50-75m? I've been victim to the recent Microsoft layoffs, so have a bit of time to work on it at the moment - looking at adding longer range CodedPhy support this week (though that would only be available on Android)
It works best if there's 3 phones though - as it can route via the other if a link drops.