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It depends on the "time out" setting in the processor. After a period of 
no signal, most will just turn off and wait for signal and turn back 
on.. If the system times out it will just start over from when it gets 
signal again. I did a 25 mile loop on a ride one time and this was in WY 
and there weren't many trees, plenty of hills and canyons though. When I 
finished I looked at it and it told me I had done 4 miles!  

You got to be careful. The technology works very well for what it was 
designed for, but measuring trails in mountains, canyons and foliage was 
not it.

Truman

Nancy Mitts wrote:

> Timex GPS Users,
> I'd like to know "how" it keeps calculating distance. "Normal" GPS 
> technology will calculate the distance from where you "were" to where 
> you are "now" even if it loses contact with you for a while. The 
> problem is, it does so in a straight line. Fine, if you're moving in a 
> straight line, it's accurate. If you turn a corner (or switchback) it 
> counts the distance cut across.
> So, is this watch assuming you're continuing to travel at the same 
> speed while "out of touch" with satellites and using that distance 
> instead of what the next satellite distance indicates?
> I can understand these things being close enough for training 
> purposes, but I cringe at the thought they're being used for 
> "official" trail measurements. Except of course, in areas where they 
> DON'T lose contact with the satellites.
> Nancy Mitts
>
>
>
> > From: "Jonni Jewell" <jonnij@xxxxxxxx>
> > The Timex GPS watch has a "feature" that when the signal goes weak, 
> > such as
> > heavy tree cover that it keeps calculating your distance and speed, 
> > from the
> > speed and direction you were traveling when the signal got weak. I 
> > have used
> > mine a lot, and it is great in clouds, and does well in the woods as 
> > long as
> > they are not constant for miles and miles. All the watch seems to 
> > need is a
> > little sky to show once and awhile, and it keeps tracking. I attach the
> > transmitter unit to the front of my saddle, instead of using the arm 
> > band.
> > If I get off the horse, and get the watch any distance from the 
> > transmitter,
> > then it will lose the reading...but I don't get off the horse much. 
> > (tho I
> > should!)
> >
> > Jonni
>
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