Orca supports importing and exporting GPX files.
When importing or exporting to GPX, GPX Waypoints will be saved as Spots, while GPX tracks will be saved as Routes.
How do I import a GPX file?
To import GPX file into Orca:
iOS and Android: From the application you want to share from, share the GPX via the standard share menu and select Orca as your share destination
MacOS: Right-click the GPX file and select Open With > Orca
Imported routes have a limit of 300 waypoints per route. If your GPX file has more waypoints than this, use a simplification tool, such as OpenGeo to simplify your route.
How do I export a GPX file?
To export a Route or Spot as a GPX file, open your Route and Spot list from the Main Menu, press the three vertical dots of the item you want to export, and then select Export GPX.