So which do you go with when they disagree? If your eyeball sees a landmark that you believe puts you at point X, but the GPS says you are at point Y, which do

So which do you go with when they disagree? If your eyeball sees a landmark that you believe puts you at point X, but the GPS says you are at point Y, which do you believe? For me, absent any other facts, I default to trusting the instrument over the human. I think the risk that the is human misidentifying a landmark is greater than the risk that a ship's GPS is malfunctioning. Again, absent any knowledge of hacking/spoofing in the area.