I realized that Altitude reported by (A)GPS device reports roughly 40 meters Alt near to sea level.
Tracks from the trim will be available later.
NOTE: I know that Geoid is just approximation.
OpenStreetMap
I realized that Altitude reported by (A)GPS device reports roughly 40 meters Alt near to sea level.
Tracks from the trim will be available later.
NOTE: I know that Geoid is just approximation.
Thảo luận
Bình luận của kaerast vào 5 tháng 07 năm 2009 lúc 11:47
GPS is generally pretty terrible at altitudes, it just gives a very rough idea. Also, it'll be altitude above mean sea level not actual sea level where you are.
Bình luận của Skippern vào 5 tháng 07 năm 2009 lúc 16:33
You can callibrate altitude in most advanced handheld units, but mark that Geoid altitude and reality differs around the planet, +/- 60 meter AFAIK.
Bình luận của Biogenesis_ vào 6 tháng 07 năm 2009 lúc 04:55
Altitude calibration is for any hand held unit which has a barometric altimeter in it. Ie, one which estimates altitude based on changes in air pressure.
Garmin units which have the required hardware include the eTrex Vista HCx (top of the line eTrex) and several of the Summit units.