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.
דיון
תגובה מאת kaerast על 5 ביולי 2009 בשעה 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.
תגובה מאת Skippern על 5 ביולי 2009 בשעה 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.
תגובה מאת Biogenesis_ על 6 ביולי 2009 בשעה 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.