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For playing golf, you might consider the old-fashioned CF GPS receiver (something like the Holux 270 from Semons). The power draw for Ax + GPS should be no more than Ax + Bluetooth. You have one unit instead of two. The receiver I mentioned works great without an external antenna -- especially when you are on the golf course instead of in your car. GPS without WAAS gives you position within 10 M. Unless you're in Tiger's category, that should be accurate enough to help your game.
... or, if you haven't bought your Ax yet, you can wait for the X7 with built-in Bluetooth, so you don't need a BT card for your Ax.
Just a thought.
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The world may not be perfect yet, but the Axim is (almost).
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