1. pitou2k's Avatar
    All the firmwares I tested, even the 167, using GPS applications, it reports a negative altitude.

    i.e. Paris -162 m, below the see?
    10-08-08 07:33 AM
  2. beartenor1's Avatar
    I have an 8830 on Sprint and Spot always reports a negative altitude for me as well ( -550 ft in Huntsville, Alabama ).
    12-12-08 06:35 PM
  3. PittsDriver's Avatar
    What program are you using to see altitude?
    12-12-08 06:46 PM
  4. Branta's Avatar
    All the firmwares I tested, even the 167, using GPS applications, it reports a negative altitude.

    i.e. Paris -162 m, below the see?
    Altitude is the least accurate parameter determined by GPS. If your position is correct (Latitude, Longitude or as shown on a map) don't worry too much about it.

    FWIW I have seen a 20,000 tonne ship go from near sea level (alt = 0) to +300 metres if the GPS was to be believed (This was a good quality approved marine GPS). We suspected local interference to the radio signals, probably a microwave radio link but it was never proved.
    12-12-08 07:08 PM
  5. ohbarnes's Avatar
    I have the same problem on 8310 with most GPS software (GPSed, TrekBuddy, GPSTracker, bbTracker) except InstaMapper (http://www.instamapper.com/download/GPSTrackerBB.jad) which shows the same altitude without the -XXXft
    03-13-09 11:45 PM
  6. jonasbeaver's Avatar
    get WAAS for the phone
    Wide Area Augmentation System - Wikipedia, the free encyclopedia
    its only a $5k upgrade for the plane i fly...

    that said, my GPS seems to be within about 30 feet horizontal and 300 feet vertical, that is about what you can expect with a normal GPS
    03-13-09 11:50 PM
  7. ydaraishy's Avatar
    WAAS won't work on a phone. You need separate dedicated equipment for that.
    03-14-09 01:40 AM
  8. AP1618's Avatar
    some applications give an option to remove the minus sign. i think blackstar and GPSlogger have that option.
    03-19-10 06:34 PM
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