Export from Trasely
Choose GPX. If you use Trasely PRO and your Polar workflow prefers it, TCX is also supported by Polar Flow.
Use this for compatible Vantage, Grit, Pacer, and Ignite watches with route guidance.
Import the file into Polar Flow Favorites, then sync the route to your watch with Polar Flow.
Choose GPX. If you use Trasely PRO and your Polar workflow prefers it, TCX is also supported by Polar Flow.
Open Polar Flow on the web, go to Favorites, choose Import route, and upload the GPX or TCX file.
Save the route as a favorite, then sync with the Polar Flow mobile app or FlowSync on desktop.
Start the activity on your watch and choose the saved route from route guidance or favorites. Some watches can guide you to the start, end, or nearest point on the route.
Reference: Polar route import and Polar route guidance.