You import a friend’s cycling route, open it in another app and find that one section follows a different lane. The file arrived. The route still needs a closer look.
A GPX file is a way of exchanging geographic data. The GPX 1.1 specification supports waypoints, routes and tracks, with optional details and extensions. The .gpx ending alone does not tell you which of those details a particular exporter included.
Think of three separate things: the line representing the journey, the map underneath it, and the instructions used to navigate. Moving a file does not necessarily move all three.
Komoot’s export and import guidance gives a concrete example. Its GPX exports contain the route’s GPS geometry. They do not include the komoot map, voice navigation or waypoints added during planning. Another app receiving that export therefore has less information than the original planning screen displayed.
Importing can introduce another change. Komoot explains that when a route departs from its known paths, you can retain the original line with off-grid sections or let it match the route to known ways. Matching can change the path. Keeping the line can mean less accurate navigation.
Those are different outcomes, even though both begin with the same file. Neither choice should be treated as an automatic confirmation that the route matches what you intended to ride.
For a weekend cycling route, I would compare the imported version with the original before heading out. Look closely at junctions, crossings and any section where the line leaves a mapped road or path. Check the start and finish as well as the overall shape.
Then check anything the original description told you to expect: an unpaved stretch, a planned stop or a particular crossing. Look for that information explicitly instead of assuming the transfer preserved it. If a route section has moved, establish why before accepting the change.
Keep the source route or its link available while reviewing. A similar distance does not establish that both versions follow the same roads.
Before riding an imported route, establish which roads and paths it now follows, and where the receiving app has changed them.