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.
토론
2009년 7월 5일 11:47에 kaerast님의 의견
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.
2009년 7월 5일 16:33에 Skippern님의 의견
You can callibrate altitude in most advanced handheld units, but mark that Geoid altitude and reality differs around the planet, +/- 60 meter AFAIK.
2009년 7월 6일 04:55에 Biogenesis_님의 의견
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.