My good old Garmin eTrex 30 has died.

Looking at replacements for it and it seems to be $599 and up for something close now. Enter the cheap part, I have my old iPhone 6 Plus (HUGE screen) with a broken screen. I can get it fixed for around $60, and then clean it out for a motorcycle dedicated unit on the handlebars. Been looking at GPS software from GAIA but it has a subscription and might not interface with what I want.
Anybody use their phone for a GPS? And what apps do you use?