The GPS:
Friend or Foe of Desert Caves?
What can it do for you?
Should you get one?
When I lived in Saudi Arabia, I discovered that the GPS has both a bright side
and a dark side and even though the device has evolved over the years, it
continues to be a source of both good and evil for this little old planet of
ours.
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The entrances to many of these cave systems, however, were often small holes
only 50 centimeters around and relocating one of these holes in a
“featureless” (to everyone but a Bedu) desert, was like trying to find a
bread crumb in a sandbox. You could literally be standing three meters from
the entrance to a major Saudi cave and not see it at all. If you want to
know just how difficult it was to get around in the desert in the past, see
The Joy and Terror of
Caving in Arabia in the Early Days. Susy Pint in the entrance to Surprise Cave...not so easy to find without a GPS. |
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But along came the GPS, a navigation device that receives signals from the
Global Positioning Satellites originally put in place by the U.S. military for
their own purposes. At first they deliberately distorted the signals so the
accuracy of the thing was limited to 100 meters—only if you were a civilian, of
course. What this meant was that in the desert, we often had to drive back and
forth across a 200-meter-wide circle in order to find our cave—but we did it
without complaint.
Then, in May of 2000, the U.S. Armed Forces reluctantly turned off their
“fudging machine” and GPS units all over the world were suddenly accurate to
within about three meters. What used to take days before the GPS now took
minutes: it was incredible!
Only much later did we discover the evil Jinn that lives inside the GPS. People
would go out in the desert, discover some marvel like a half-buried mammoth
tusk, an area full of sharks’ teeth or a cave full of delicate formations and
the next day they’d email the coordinates to their friends—all of them
nature-lovers, of course. Emails, however are soooo easy to forward and
eventually the coordinates would reach The Bad Apple…or maybe in Arabia we
should call him The Rotten Date, and this individual would forward that email to
his less-ecologically oriented friends, maybe the kind of people capable of
breaking off and carting away every last stalactite in a cave or covering the
walls with graffiti.
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What Hath the GPS Wrought in Saudi Caves?
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Mahmoud Al-Shanti shows broken stalactites in Surprise Cave |

John Pint trying to wish away the graffiti in Murubbeh (Shawiah) Cave. Photo P. Forti.

One of two human skulls later stolen from Murubbeh Cave, almost certainly with the help of a GPS.
Assuming that you are not a cave vandal, let me share what I know about whether
or not you should buy a GPS.
Let’s say you are a person who enjoys hiking off the beaten track, as I do.
First of all, the main benefit of a GPS made for hikers is, in my opinion, that
it automatically records every step you take. So, if a local guide takes you
along a convoluted route to a heavenly swimming hole in the middle of a chaotic
lava field, you’ll be able to go back there on your own next week or five years
later. You just have the GPS save this “track” and pass it to your computer for
future use. The automatic recording is also useful if you happen to get lost.
You just turn on the “trackback” feature of your GPS and it will faithfully lead
you back to your car or wherever you came from.
These features are found in small units about the size of a cell phone, made for
hikers and boaters, such as the different models of the Garmin Etrex. Most of
these models now feature “high sensitivity” (HC in Garminese), meaning they work
quite well under tree cover or inside cars.
On the downside of the many hikers’ GPS’s made by Garmin and other companies, is
that every one I’ve ever seen is so user-unfriendly that you really have to put
in time to figure the thing out. Like so many modern electronic marvels, these
gizmos were designed by nerds for nerds and they just can’t resist giving you
10,000 options you really don’t need.
Conclusion: if you like to wander about in the boonies, you’ll get a lot of
benefit out of a hiker’s GPS, but if you’re the kind of person who needs to ask
someone else to put a new entry into your mobile phone’s address book, forget
it. Otherwise, go out and get yourself an Etrex (with HC, of course). You
shouldn’t have to spend much more than US $100 for one.

Umm Jirsan Cave, lost deep inside Harrat Khaybar Lava Field. Without a GPS, we'd have a hard time finding it.