barometric altimeter accuracy

[Lyon]

Hi

Congratulation for developping Orux! my GPS sleeps now in its box.....



A suggestion to increase altimeter accuracy:

when using barometric altimeter, we use "standard atmosphere" ( 15°C @ sea level, decreasing O,65°C/100m => 0°C is @ 2300 m heigh). Unfortunately, this structure doesn't happen so often. Air density used for computation is wrong, so heigh indication is either optimitic or pessimitic (error can easily go to 40-50 m for a 1000m tour). It would be easy to correct it, with an "expert mode" where user writes 0°C elevation, and orux could calculate/display real altitude.

Thank you very much in advance !