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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?
 

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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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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
 

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That watch was over $600... yikes
 

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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.... :-d

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

la la laaaaaa...... deeee dummmm..... taaaa ttaaaaaaaaaaa
 

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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.
 

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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.
 

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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?
 

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Discussion Starter #11
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.
Well the other .001% seem to buy quite a lot of atomic/waveceptor watches. The point was if it's to be done at all, could it be done more effectively? And I don't think this forum is about what you absolutely need from a watch...or that a "bare necessities" argument is very convincing from someone with Rolex Precista and Omega in their sig :-d
 

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GPS available everywhere?
Yes GPS is available every except inside buildings and maybe the north and south pole. LOL. The signals are sent from 22 satellites that are in very exact geosynchronous orbit around the earth. Hence the reason for 12 channel receivers. Since there are 22 satellites there is only about half can visible at one time to any spot on the earth. But there are mountains, buildings, and trees that block some as well. The most I have had at once is 6 or 7. The satellites have what is called selective availability, the ability to encode the signal so that civilian GPS receivers will be useless but the military ones can have decryption software installed so they will be able to still use it. This was made on the theory that when we go to war we do not want the enemy to use this system. It was designed and fielded by the US military in the mid 70's to early 80’s. Then the civilian market started using it. In the late 90's it was realized that the civilian sector relied on GPS so much that the US passed a law that stated they would not turn on what is called selective availability.

I have used the GPS in my car in Germany with the Garmin mapping system and it is awesome. If you have an address it will guide you to the front door. My GPS saved my life in Kuwait and Iraq out in the middle of the desert where you have no idea where you could be all you know if that you must go from point A to point B.
 

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Casio need to make a watch that can control the satellites, and thus give the wearer ultimate spying power...

...they would have to wear the solar panel on their head though. :think:
 

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My guess is that if all you wanted to do was pick up the time signal, then the power consumption would not be an issue, (especaily with solar power), in theory the job is pretty much the same as the atomic sync.

I think that recption would be the problem, likely much worse than the atomic transmitters. When we see GPS working so well in cars and the like, it is easy to forget that, as some here have said, it does not work in buildings, often it won't even work close to buildings, the steep walls can prevent it "seeing" any satellites.

It would be a great option as a world wide system, but less practical than atomic radio sync for most of the core market areas.

Luke
 
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