My experience with range finders, exceeding 200 yards is all seem to work close to as advertised for the first year or two and all go to shit after that. Leopold, Sig and Bushnell, Have all done the same thing now
Depends on the guys. Have gone as high as 30-35% to as low as 5%, Some gal in Hawaii was a complete witch and nothing on the boat worked, didn’t catch anything which I know is hit or miss, they really didn’t even try it seemed like, that was more in the 5% range but gave the deckhand some more
Had this happen up at Tiber this year when trying to pull my boat out, pickup wouldn’t start. Battery terminals badly corroded. No cell service, frick. Lucky to have farm friends camped nearby helped me out