Randell Tarin <[email hidden]> wrote in message news:<[email hidden]>...
Quoted message said:Are the users of a GPS using this in lieu of an ordinance map and compass OR
in addition to it.
The reason I'm asking is that I'm relatively new to both and since GPS
technology is relatively new, I wanted to get the opinions of the more
experienced.
Which do you prefer and why?
Randell
Now thats a post thats sure to stir things up around here!
Disclaimer:-
This is my personal opionion, feel free to disagree ;-)
I don`t think (and hope) that there are any users round here that use
a GPS completly in lieu of an OS map and compass. To do so would be a
very silly idea indeed. I think the usual debate here is what tool is
the principle navigation aid and what is the backup. My personal
preference to rely on the map/compass but carry the GPS turned off at
the bottom of my bag as a backup, this I find works very well. Other
people choose the reverse option and thats their choice and thats fine
by me. I wory that I may become dependent on it or loose my
navigation skills otherwise. I don`t think a GPS spoils the sense of
wilderness as much as a mobile phone or much more than a compass. a
phone is a direct link to civilisation, a GPS is a direct link to some
satellites miles overhead. Why do I have a GPS? Apart from being a
sucker for new technology, I did a lot of GPS/GIS at University and
was excited by the potential. Now I write software for a survey
company where high precision DGPS is an amazingly useful tool. A lot
depends on what type of walking you do and the consequences of
instrument failure (remember that even in some parts of the UK, even a
compass reading can be dubious due to magnetic rock). Walking solely
with a GPS would be easier on open moorland than farmland but the
consequences of instrument failure would be much greater. I think
everyone needs to understand the limits of their choosen nav-aid,
whatever it is.
Reasons against relying on GPS
A GPS is an electronic device and despite usually being well
protected, can still break. I still love the way you can wash the mud
off in a stream! True, a map can also rip/get blown away but if
you`re that worried, a spare map wont cost as much as a spare GPS! A
GPS runs on batteries, maps and compasses dont. Batteries run out
when people forget to check before leaving, people forget spares and
battery life depends on temperature. A GPS compass requires the GPS
to be in motion (I know some GPS`s now have electonic magnetic
compasses, are they any good?). A GPS might show your position to an
enoromous level of accuracy and precision but without a map, its
pretty meaningless - it wont show the river you have to cross/cliffs
to avoid whilst in the hills, nor will it show all the realy useful
stuff like farms/woods/fields/streams/paths when walking lowland
farmland. No doubt when Anquet bring out OS mapping for palm-tops,
this wont be so much of an issue (this may be do-able now?). You`d
need to put on a load of waypoints with every path dog-leg marked to
avoid it taking you on a merry dance through every bog in sight.
Adding waypoints without a PC is a serious chore. GPS can be dubious
in woods/high sided valleys. An incorrectly set GPS (Datums,
spheroids...) is a liability. If your GPS packs up and you have to
resort to map and compass, it takes time to get used to using the map
again, just like when a mate passes you the map to lead and you havn`t
really been following the route. A GPS may possibly lead you into a
false sense of security - would you realy have carried on in the fog
without it? A GPS will hinder learning good navigation skills if it
gets brought out when things start to get tricky.
Reasons for carrying a GPS as a backup to map/compass
Handy to check position with what you think it is when not sure. It
could save accidentaly walking down a dangerous route, wasting time
trying to work out your location when you get a bit lost and very
useful when leading a big group ("Ok everyone, back over the barbed
wire fence, we`ve just gone the wrong way..."😉. If you suffer an
accident, the rescue teams would prefer a nice accurate 8 fig GR to a
rushed, incorrect GR. The ETA time for a track and the current speed
helps keep your speed up. They make practicing pacing and other
navigation techniques great fun - check your start with the GPS, walk
to a point and see how far off you are. They help finding that
ellusive hidden carpark. They help find that ellusive
unwalked/unmarked path. They help mark that must-return-to wild camp
location/view/lunch stop. They let you download the route you
actually walked when you get home and have a good laugh. It`s
probably the most accurate clock in your house. Mine will tell you
sunset times, handy when taking photos of sunsets/knowing what time to
pitch your tent. You can try Geocaching. You can calibrate your cars
speedo. It may give you a useful alibi ("It couldn`t have been me
officer, I was out walking, just look at this track."😉. Handy for
finding your car in airport carparks. They make great discussion
points. A dead GPS will make a handy door-stop...
My advice, always carry a map and compass. learn how to use them.
When happy with a map and compass, consider a GPS but never consider
it as a replacement or come to rely on it.
Ed.