With GPX2Nav you could load any GPX File (from IOS via "Open In" (Mail, Dropbox...) ) or Download it directly from a Web URL.
You are able to use Waypoints (select, reorder, ...), Routes or Tracks to send it to the IOS App Navigon™, TomTom™ or Garmin StreetPilot™ to use it for Navigation.
It will also compress Tracks or Routes to 24 Routepoints as this is the maximum limitation of Navigon™ for Routes.
It will also Display the GPX Routes, Waypoints and Tracks on a Map.
Notes General: This is a companion app to the Navigon™, TomTom™ and StreetPilot Apps and is not the actual Navigon™ GPS App. In order for the app to work you will need a Navigon™, TomTom™ or StreetPilot™ App installed on your IOS Device.
Notes for Navigon™: The Navigon™ App, has as this is a limitation of 24 Routepoints. Therefore the either you could transfer the first 24, let my App compress the list of Routepoints to 24 or use the first and last Routepoint.
Notes for TomTom™ and StreetPilot™: you could only export a Single Waypoint, Routepoint or Trackpoint to the Navigation App, as this is a limitation for this two Apps. You could select the Waypoint you want to use or the first or last route or trackpoint (NOT applies to Navigon™ Apps)
If you have any issue with a GPX File, please contact me via my support site and send me the GPX for analysis.