GPS Timekeeping?

Thread: GPS Timekeeping?

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  1. #1
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    GPS Timekeeping?

    If Casio can put a 12 channel gps into this watch

    http://www.sailgb.com/p/casio_gps_watch_gpr100/

    given that gps is available all the time and everywhere and its timekeeping is dead accurate all the time, would it not make sense for Casio to accept that "atomic" timekeeping is klunky and limited and to make watches which sync with gps? Could this be done with a smaller and cheaper subset of what is in the 12 channel watch if you only want time - not positional - information?

  2. #2
    Member tribe125's Avatar
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    Re: GPS Timekeeping?

    Good question - only wish I was equipped to answer it.
    I used to list my watches here until I realised it ruined people's Google searches...

  3. #3
    G-Shock Mod stockae92's Avatar
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    Re: GPS Timekeeping?

    GPS sucks up a lot of juice and the run time is very low

    i don't remember exactly what the run time with GPS enabled, but i am think its in the range of 2 hr something ... ?

    you can't even run a marathon with that watch's low run time

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  5. #4
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    Re: GPS Timekeeping?

    I suspect battery longevity to be the answer here. All the GPS watches i've ever heard of have rechargeable batts. GPS receiver will suck the life out of the battery like a hoover . Fine for a day or two out in the wilds (or whatever specialised purpose you require a GPS watch for), not so good for years of everyday wear if you have to recharge the watch every day

    Rusty

  6. #5
    Member Gawain's Avatar
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    Re: GPS Timekeeping?

    That watch was over $600... yikes
    Orient: Black Mako (FEM65001BW)
    G-Shock: DW9052-2V, DW56RT-1V, G2500-3V, DW-9700UL-9T, DW-003S, DW-003H-9T, G9000-MX4, DW-004, GW-9200RJ-4JF, G-5500SRF
    Seiko: SKX781 Orange Monster, SNK807 Seiko 5, SUN017P1, SNP105 (incoming)
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    "Don't wait for the perfect moment, take this moment and make it perfect."
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  7. #6
    Member tribe125's Avatar
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    Re: GPS Timekeeping?

    Quote Originally Posted by Gawain View Post
    That watch was over $600... yikes
    You could buy 37.5 G-Shocks for that.
    I used to list my watches here until I realised it ruined people's Google searches...

  8. #7
    Member Gawain's Avatar
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    Re: GPS Timekeeping?

    Quote Originally Posted by tribe125 View Post
    You could buy 37.5 G-Shocks for that.
    LOL.. if my luck kept up.... oh, and to rub it in... I won the watch for $9.99. The $16 included postage....

    Sorry Alan... I just couldn't resist..... I'm having fun tonight.....

    la la laaaaaa...... deeee dummmm..... taaaa ttaaaaaaaaaaa
    Orient: Black Mako (FEM65001BW)
    G-Shock: DW9052-2V, DW56RT-1V, G2500-3V, DW-9700UL-9T, DW-003S, DW-003H-9T, G9000-MX4, DW-004, GW-9200RJ-4JF, G-5500SRF
    Seiko: SKX781 Orange Monster, SNK807 Seiko 5, SUN017P1, SNP105 (incoming)
    Tissot: PRC200
    Other: Stuhrling Skeleton (1070.33161)

    "Don't wait for the perfect moment, take this moment and make it perfect."
    ---Dr. Simon Atkins

    "Reality is an illusion, albeit a persistent one."
    ---Albert Einstein

    "The capper is that, like life, golf is a game that can't be won, only played."
    ---Bagger Vance

  9. #8
    Member stan2323's Avatar
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    Re: GPS Timekeeping?

    Quote Originally Posted by englishperson View Post
    given that gps is available all the time and everywhere and its timekeeping is dead accurate all the time, would it not make sense for Casio to accept that "atomic" timekeeping is klunky and limited and to make watches which sync with gps? Could this be done with a smaller and cheaper subset of what is in the 12 channel watch if you only want time - not positional - information?
    To get a position fix with a GPS you must have minimum 3 satellites. They way it works is the GPS unit calculates it position to be a certain distance from each satellite a sphere with a certain amount of accuracy. Then where the spheres from 2 satellites intersect then you are on that line of intersection. The 3rd satellite makes another sphere that intersects with the other 2. Thus you have 3 intersecting spheres to know you position. The more satellites you have the more spheres you have intersecting and the more accurate your position. It averages all the intersection point of all the spheres to get more accurate. I say sphere but it is really a part of a sphere as the receivers are programmed to know you are on earth and not out in space.


    To answerer your questions. Yes Casio could do it. They would only need a single channel receiver to receive one satellite signal at a time. Now for the reality of it. It would draw much power. I think that it would cut the battery life in half for the watch just to sync it once a day. Given that the antenna and receiver would have to be made for signal. If they made it sync only once a day then you would have to be outside during that time to get the signal. The GPS signals will not go inside a building at all. If you are moving such as walking or driving GPS sometimes has trouble getting the signal. It would be too troublesome for people.

    But it is a good thought and valid point. Maybe with the systems that Europe is putting in orbit it may be possible. I heard the system they are going to use will go in building ect.
    Stan The Man




    Careful what you wish for. YOU MAY GET IT!!!

  10. #9
    Member Seamaster73's Avatar
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    Re: GPS Timekeeping?

    Overkill.

    Let's be honest, a quartz watch doesn't even need once-a-day atomic time-sync to be more than accurate enough for 99.99% of Casio customers. So what possible value constant GPS time-sync could add, I cannot fathom.

  11. #10
    Member tribe125's Avatar
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    Re: GPS Timekeeping?

    Quote Originally Posted by Seamaster73 View Post
    Overkill.

    Let's be honest, a quartz watch doesn't even need once-a-day atomic time-sync to be more than accurate enough for 99.99% of Casio customers. So what possible value constant GPS time-sync could add, I cannot fathom.
    GPS available everywhere?
    I used to list my watches here until I realised it ruined people's Google searches...

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