>
>The Magellan GPS 4000XL is an excellent example of the new technology used to
>its utmoste advantage. By locking onto the signals of up to 12 satellites at
>a time (or in paralled channels), the 4000XL is much more effective than the
>first generation receivers. The parallel uplinks allow the unit to be used
>under those heavy forsest canopies and in whiteout snowstorms......... >>
>
>I think that it was the trees and hills that blocked out a Tweeters user.

A good compliment to any GPS reciever is an active external antenna. I
purchased one from Lowe Electronics for my Garmin GPS 12XL (also a 12 channel
parallel receiver). I can mount it on the top of a piece of PVC tubing
that sticks up vertically out of my backpack. Makes a tremendous difference
under heavy tree canopy.

Along these lines, I'd encourage all birders with GPS capability to include
lat/long coordinates when giving directions to a rare bird!

Arlen



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Arlen Fletcher
fletcher at paccar.com
Mount Vernon, Washington, USA

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