Hate to say it - the worst part of the program is the altitude... it's all over the place! Maybe Mags Can get this right for us... anyway I have twice "tripped up the lies" GPS puts out... Altitude of -6 when you are on the second floor... well you can tell.
For the second year in a row I have "sat" on the beach in Delaware and waited for a while for the GPS to get a clue... then typed in 0000 for the altitude. This time I turned off Auto Calibration, Began auto calibrate and entered the correct alt..
I hope I understand it right I picked sea level between high & low tide. When I got home the Alt appeared right for the second time.....
Hey I realize that this is not a big deal for most of us,,,, but when the unit is reading barometric pressure... its important to know its accurate and right on most things....