iGS60/iGS618/iGS620 supports to navigate with road files with GPX、TCX、FIT format.
If the GPX file can't be well navigated, pls fix the problem from the following two points :
1. Test the navigation function of the bike computer
You may test if the navigation can work well with fit route.
If yes, the problem should come from the incompatiblity with the GPX file.
In this case, we recommend you plan a new route at iGPSPORT APP web and try again.
2. Test the GPX route.
You may further test if the GPX file can work well when trying to upload to other cycling computers.
Or plan a new file at fit format and try again.