I have more and more worries about the GPS tracks of my watch.
At the settings level, I am on GPS + GLONASS with a recording every second.
How to make the traces more accurate?
I included links to a recent run using the 945LTE (GPS+Glonass) and a new Instinct 2X (Multi-band; highest accuracy). The 945 wanders just a bit more than the Instinct, but looks really good to me. This is the typical tracking that the 945LTE gives me.
Make sure you've sync'd your watch with Garmin (Garmin Express or Garmin Connect) to get the latest satellite almanac (locations) file loaded on your watch.
945 LTE using the GPS+Glonass setting:
Instinct 2X using the Multi-band setting: