Altimeter accuracy

Thread: Altimeter accuracy

Results 1 to 4 of 4
  1. #1
    Member
    Join Date
    Aug 2012
    Posts
    62

    Altimeter accuracy

    Ignore the fact that I wrote Altimeter accuracy...I mean't barometer! Any mod to change the title?

    Nearest weather station is reporting 1010hpa.

    My watch is reporting 1004hpa.

    Weather station will be reporting sea level pressure, watch will be reporting station pressure.

    I'm roughly 36m ASL. so assumming -1hPa per 8m elevation that puts my sea level pressure at 1004+(36/8) = 1008.5

    So roughly 1.5hpa off the weather report.

    Is that about right in terms of accuracy for these watches? I know my calculation is rough, and doesn't include temperature etc. Also the station 10+ miles a way.
    Last edited by lnoton; August 28th, 2012 at 10:29.

  2. #2
    Moderator G-Shock Forum Sjors's Avatar
    Join Date
    Apr 2005
    Location
    Netherlands
    Posts
    21,491

    Re: Altimeter accuracy

    Well, I have changed the title for you

    My experience with the Barometer and Altimeter functions on sensor G-Shocks are all positive. I once was fooled by the newspaper, who gave a total other reading than my Riseman. When checking the actual air pressure, it showed my Riseman was right and the newspaper was wrong. I wouldn't worry about 1 or 2 hPa, but 6hPa sounds a bit off. Important note to the use of the Barometer are:

    The Thermometer must give the right temperature of the sensor (the barometric sensor is not only pressure dependent).
    Use it outdoors. AC systems create overpressure
    The trend is more important than the actual reading.
    For use of the altimeter, With 5 meter increments, it's relative inaccurate between small altitude changes. My experience is that the Altimeter works pretty good for a hobby watch.


    Cheers,

    Sjors
    There are only 10 kind of people. Those who understand binary and those who don't.


    Bezoek ook eens het Nederlandstalige WUS forum: Kaliber 2010


  3. #3
    Member
    Join Date
    Mar 2008
    Posts
    1,777

    Re: Altimeter accuracy

    I have not used the barometer. But my altimeter is pretty accurate...at least relatively. It reads about 50 feet higher on every level than what the map shows. But it is consistent.
    ShockMister

  4. Remove Advertisements
    WatchUSeek.com
    Advertisements
     

  5. #4
    Member cal..45's Avatar
    Join Date
    Jun 2006
    Location
    CMOWE (Central Madhouse Of Western Europe)
    Posts
    8,516

    Re: Altimeter accuracy

    Casio barometers CAN be pretty accurate, IF they are thermal compensated (the PAW-1300 series is the absolutely worst I have ever encountered regarding this). Still I haven't had one single Pathfinder/Protrek to date which wasn't off by at least 2-3mbar (hpa) measured against other calibrated barometers. Not a big deal, you adjust it once to such a source and it will be good to go forever. The altimeter is a whole different ballgame and is pretty much useless, unless you calibrate it very often (but definitely before a hiking tour or such) and hoping that weather changes are moderate and don't kick into the calculation too much.


    cheers
    Last edited by cal..45; August 28th, 2012 at 13:24.
    We are 12.6 %

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

    Posting Permissions

    • You may not post new threads
    • You may not post replies
    • You may not post attachments
    • You may not edit your posts
    •