Hi,

Mostly interested in stuff I could do with a smartphone, specifically Google Maps turn-by-turn with map zooming in and out that shows terrain and bicycle routes. Maybe Waze could enter the bicycle mapping market with similar reliability. Elevation could be displayed with the turn-by-turn screen. Menus could show miles per hour, miles traveled, alternate routes, and so on. I suppose the Wahoo Element Bolt is a nice size. Don't want to hurt feelings at Garmin nor Wahoo, nor similar companies, but if they can't have Google or Waze popping up on 5G I suppose there are plenty of devices without GPS they could continue to sell. Seems to me that downloading maps in advance is a waste of time and without knowing better I don't trust it.

Heads up display inside your cycling glasses so you always are watching the road ahead of you.. and not heads down looking at your phone.

Nice thing about turn-by-turn directions is that you could turn volume on and listen.

This saves battery and works in places without cell phone service.

Cellphone coverage is spotty and you are SOL without downloaded maps if you don't have cell service.

Being able to download maps lets you have maps for places you don't have a cell-plan for.

True. So, downloading maps is probably good as a security net. Ideally the type of computer I described could have ability to store downloaded maps also.

A bike computer that doesn't work in the the beautiful Cascade Mountains? I'll pass.

Without GPS it's only a cyclocomputer without any routing/navigation/map-possibilities.
Downloading maps in advance tooks less than a minute for an area you'd take hours to ride by bike.
It's not any matter of trust but of beeing independ from mobile network and data plans.