Trevor Barton wrote:
> *Shudder*. I can't think of a good reason for using GPS anywhere in the UK when walking or even
> riding for that matter. It's not like you're going fast enough to get lost if you can read a map.
> If you can't read a map enough to localise yourself to within 1 or 200m or so on a 1:25000 map you
> ought to seriously consider figuring out how.
This assumes the only reason to carry one is not to get lost. It's like saying there's no reason to
use a cycle computer because they're not necessary to ride from A to B. If you happen to like
logging information about your journey then that's reason enough in itself to use one.
> However, if I was trekking anywhere there weren't high quality maps I'd be tempted, although to be
> of any use you have to know good coordinates for the places you want to get to, anyway, which
> implies maps?
Mark a waypoint of where you put your tent in the blizzard-prone wilderness and it'll be a damn site
easier to find it at the end of the day as the light fails, even if you've no map at all. But you
also assume you will be trekking. I don't generally use my GPS for walking, but it can be *very*
handy skiing, where your hands are full, changes of direction to control speed make following a
bearing difficult and speed is highly variable, all of which make traditional navigation techniques
much less workable. I also like the GPS in the sea kayak where the "ground" can move underneath me
and landmarks may all be out of sight.
> Surely they're accurate to much less than 100m in the UK even in handheld versions?
Yes. Originally the service was deliberately compromised by "Selective Availability" which was built
in to affect commercially available receivers to prevent their accurate use by non-NATO military
units, but SA was turned off years ago now and the accuracy is down to a few meters with a handheld
unit. The more satellites you can "see" and their relative geometry, the better the accuracy of your
location. Leave it on to help the lock and you'll typically get within 10m.
Soup said:
>> pole is a 'good thing' , if a ski pole must be used the basket should be removed.
Why? I leave the baskets on mine, stops them sinking into bogs... A full powder basket would get in
the way, but hardly anyone has them anyway.
Pete.
--
Peter Clinch University of Dundee Tel 44 1382 660111 ext. 33637 Medical Physics, Ninewells Hospital
Fax 44 1382 640177 Dundee DD1 9SY Scotland UK net
[email protected]
http://www.dundee.ac.uk/~pjclinch/