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.
การอภิปราย
ความคิดเห็นจาก kaerast เมื่อ 5 กรกฎาคม 2009 เมื่อเวลา 11:47 น.
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.
ความคิดเห็นจาก Skippern เมื่อ 5 กรกฎาคม 2009 เมื่อเวลา 16:33 น.
You can callibrate altitude in most advanced handheld units, but mark that Geoid altitude and reality differs around the planet, +/- 60 meter AFAIK.
ความคิดเห็นจาก Biogenesis_ เมื่อ 6 กรกฎาคม 2009 เมื่อเวลา 04:55 น.
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.