Extremely straightforward to learn.

I hike with a Garmin foretrex, I route plan and land nav when out there with a map. The garmin sanity checks me once in a while.

There is a significant amount of bad stuff that can go very wrong, to start, just bc your Garmin’s altimeter and calibration is bugging out while you mindlessly follow. And when you’re in areas where this matters (ie “can I hear street noise” judgment”), the out of the box technical land navigation tools tend to not work out of the box.

I’ve had an updated and calibrated Garmin put me 5-600m away from where I definitely was via map, compass triangulation and then sanity check with a iPhone b/c the difference really surprised me. 5-600m difference is quite consequential. Mix in Garmin using optionally Glonass (Russian satellites), there’s just a lot of stuff that can go sideways. Easy enough to buy a compass, map protector, local map. Even something like knowing what and how to shoot an emergency azimuth can solve an otherwise crisis situation.