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I've several of the earthmates over the years. Early ones were a little difficult to use with batteries and serial interface but the current USP and Bluetooth Earthmates are great and have integrated WAAS. The BT can run all day on a charge and both run pretty much automatically with Delorme software. Takes a little tweaking to run with ArcView though.
You can get the LT-20 w/ Street Atlas 2008 for $50 on Amazon.
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