[pct-l] pct-l] Follow-up to the earlier GPS discussion

[linda.hungerford]

In a canyon, where the signal to the GPS is bouncing around off of walls, 
your signal could be off by a quarter mile, or more.  (My track from the 
Rogue River last week has me repeatedly crossing the river to jog several 
thousand feet up the opposite canyon's walls.)  Or you could just lose the 
satellite signal entirely.  Better to know how to use the GPS and the map 
and compass, and figure out when to believe neither.

Linda

--------------------------------------------------
From: <gwschenk at socal.rr.com>
Sent: Wednesday, May 19, 2010 11:39 AM
To: <pct-l at backcountry.net>; <abiegen at cox.net>
Subject: Re: [pct-l] pct-l] Follow-up to the earlier GPS discussion

> ---- abiegen at cox.net wrote:
>
>> My brief time on the PCT this year tells me that everyone is either using 
>> a GPS or HalfMile's excellent maps which are based upon GPS tracks. 
>> Looking at HalfMile's maps you can see that on the underlying maps the 
>> PCT is often incorrectly placed, sometimes by a considerable degree. I 
>> suppose that those using only maps are okay with the trail being some 100 
>> feet or so off from where they are actually walking. So part of the skill 
>> of using maps and compass only is the ability to live with an imperfect 
>> depiction of a changeable trail.  This is easy to do when the trail is 
>> very visible. Less so when it is covered by snow. Lots of snow this year 
>> so lots of people looking for more accuracy on the trail.
>
> An inexpensive handheld GPS receiver can also have error of as much as 100 
> feet. Maps can be off, such as at Spanish Needle, but GPS has its own 
> inaccuracies.
>
> Gary
> _______________________________________________
> Pct-l mailing list
> Pct-l at backcountry.net
> To unsubcribe, or change options visit:
> http://mailman.backcountry.net/mailman/listinfo/pct-l
>
> List Archives:
> http://mailman.backcountry.net/pipermail/pct-l/