I’d just caution that following a gps route off road isn’t nearly as easy as you might expect.
Up in the lakes in the middle of a moor it’s pretty easy to glance down and know you want the left fork. In the woods at the meeting of 3 bridle ways or looking for a cheeky trail it can still be difficult. Screens are small and pretty low res, 1:50 maps dont have huge amounts of detail (and 1:25 very pricey – though not so bad if you just want a region). I didn’t get on with open streetmap (though probably much better now than s few years back).
It’s often a case of looking down and realising you’ve missed a turn (but still much quicker/less off course than going wrong with a map).
Also, don’t expect it to just work. GPX files don’t seem to be as much of a standard as you’d expect. Starting somewhere on a loop other than the original start point can be a faff.
It all works – just not as quick, simple or pain free as you’d hope IME