After 10 days, I have the answer provided by Komoot
Hello there,
Thanks for your message.
What you’re seeing is related to how komoot processes imported GPX files, and I’m happy to explain what’s happening and what you can try.
When you import a GPX file as a planned route, komoot doesn’t display the track exactly as it is. Instead, it processes it through its routing system. During this step, you’re usually given two options:
Stick to original route: keeps the track as it is, though some sections may appear as straight (off-grid) lines if they don’t match known paths. Navigation can be less precise in those parts. Match route to known ways: adjusts the route to follow mapped paths, which can slightly change the original track but often improves navigation guidance.
For round trips where the route overlaps itself (for example, going out and back along the same path), this processing can sometimes lead to unexpected results. You might see gaps, shifted endpoints, or the route not finishing exactly where it should. This can also lead to “off route” notifications on your watch.
Regarding turn-by-turn instructions, komoot provides guidance slightly before the actual turn to allow time to react. On connected devices like Suunto watches, this can feel more noticeable due to how the data is transferred, so a small offset is expected. Larger differences are often linked to how the route was interpreted during import.
Here are a few things you can try:
Re-import the GPX file on the komoot website and choose Stick to original route, then review the route carefully before saving
If the route is quite long and you’re using Premium, try importing it as a multi-day Tour with the same option
After saving, open the route in the planner and check that the endpoint and path look correct before syncing it to your device
If the route still doesn’t appear correctly after this, it falls into a known area where GPX imports can behave differently than expected. At the moment, there isn’t a way to fully prevent komoot from processing the file through its routing system.
If you have any other questions or need assistance in the future, don’t hesitate to reach out. We’re here to help!
Have a great day!
komoot Support Team
They basically confirm:
GAPs and missing parts which can lead to “out of the route” notifications (and wrong Climb Guidance ones).
Delays with turn-by-turn indications
So those both navigation issues Suunto watches have, are basically caused by Komoot, as I was pretty sure. I’ll continue with the support explaining other things like several turns in quick succession (and considering the delays), but this is a dead end.
