Final nav test at valley in Aunty Betty's Fun Jet. Low level phase looking for a small railway station near the Wash ranges. Getting closer and closer to ToT. Starting to sweat and to mutter under my breath. From the back seat "You'll see more at 200 feet than 50". Came up a "few" feet, and there it was and only + 1 second on target. Thanks M...S... (had a large Alsatian, would let people into the house but not out again)