TomTom GPS vs Garmin

[Cormanus]

I'm wondering on the ones that download the map to your phone, how it can track your exact position if it does not need or have cell contact, how would it know where you are ?

HikerToo, these new fangled smartphones have a dedicated GPS chip which, while it works better when it has cell contact, can work OK without it.

I use the TomTom app on my iPad. Works, but the screen is so big I've gone back to the dedicated TomTom GPS.

Haven't figured out how to mount the iPad on the bike yet. I see people have car mounts for them, partly so they can use the GPS apps.