Recording offset: If lake is below full pool level then add (+) the difference FP=100ft Today level=90ft Recording offset = +10ft
If lake is above full pool level then subtract (-) the difference FP=100ft day level=110ft Recording offset = -10ft
Display offset: If lake is below full pool level then subtract (-) the difference FP=100ft Today level=90ft Display offset = -10ft
If lake is above full pool level then add (+) the difference FP=100ft Today level= 110ft Display offset = +10ft
Remember to compensate for the depth your transducer is under the waterline. For example: recording offset lake FP=100' today=90' transducer=1' below surface therefore 100-(90-1)= +11 for the offset or if lake is above pool 100-(110-1)= -9 offset