GPS I've heard of, not GPX..

The GPS sattelite stuff has Supplemented NOAA paper Navigation charts,
to where you now have to download and print your own..

when you see no Shore Knowing where you are is important , there you need backups.
and old chool navigation skills are lifesavers when the tech goes down ..

on a bicycle You just stop and ask someone ..

amazed how fast electronics widget sales replaced map reading skills ..
glad you all have gained so much freely disposable income .