Try changing the setting from "above me" to "above start." When you use "above me" it uses the GPS in your iPad to figure your height, and subtracts that from the birds height. When using "above start" it only uses the GPS in the bird's transmitter and just subtracts the starting number. It will be more accurate, because many times the GPS on your iPad will have inaccurate numbers, and it takes that completely out of the equation.