That's very cool. One time, I decided to just put the phone in my pocket and take my bike to a location. I had the ear buds in my ears, I thought, voice is enough... Oh my, was I wrong. I ended up missing most turn off in streets due to latency, some crossings made no sense over audio, a total disaster. So I got a stand to attach the phone to the handle bars... And that works great, for about 20 mins. I live in Austr…
This is by far the best way I've found to use mapping apps while riding. Setting aside the heat issue, GPS apps require more concentration than I like to give them while riding. It's a lot easier to check other vehicles rear view mirrors, judge intent of drivers, and just generally keep your head on a swivel without a GPS to look at.
I have found that for the occasional reminder, my Apple watch's taps work well (can't see my watch though, so you gotta remember which taps are which for left/right).