That kind of GPS drift in dense forests and rugged terrain is pretty common, even on newer phones like the Pixel 6. The trees and ravines can block or reflect satellite signals, causing the location to jump around. Since you already tried toggling airplane mode and location services, one thing that helped me on similar trips was using an app like GPS Status & Toolbox to reset and refresh the satellite data before heading out each day. Also, some hikers swear by downloading offline maps with apps like Maps.me or Gaia GPS that use a combination of GPS and stored map data to improve tracking when signals get sketchy. It’s not perfect, but it can reduce the frustration of wandering dots on the screen. Did you notice if the drift got worse during certain times of day or weather conditions?