08-09-2021, 10:27 AM
Marble (the kde map app) on the older release (I haven't finished upgrading to the most recent one) of postmarketOS at least is able to route and it appears to be able to get the phone's approximate location via some QT library (which may or may not be using the GPS.) It looks like the offline routing daemon (I don't remember the name of it) isn't packaged.