I fly twice a month (international and domestic) and not once has a flight been cancelled due to Kp index (including occasions when i have happend to look at UAV forecast while sitting in the flight lounge and high numbers were indicated).
To answer the OP loss of GPS or Compass throwing a leg out of bed will make any reported AC position as depicted on the map in GO unreliable so trying to follow the green line to the extent it remained visible would prove difficult if not impossible.
I have flown with a dodgy compass calibration and the AC heading as depicted in the radar in GO was 180 deg out. If i wasnt close enough to cleary see the orientation of the AC i would have had no hope of landing.
To answer the OP loss of GPS or Compass throwing a leg out of bed will make any reported AC position as depicted on the map in GO unreliable so trying to follow the green line to the extent it remained visible would prove difficult if not impossible.
I have flown with a dodgy compass calibration and the AC heading as depicted in the radar in GO was 180 deg out. If i wasnt close enough to cleary see the orientation of the AC i would have had no hope of landing.