Certain models of iPAQ Pocket PCs and Palm OS PDAs have a proprietary expansion slot into which you can plug hardware devices. These add-on pieces of hardware are often called sleeves because they fit around the PDA.
The same advantages and disadvantages found with GPS receiver cards (they’re convenient but can run down the PDA’s battery quickly) also apply to GPS sleeves. Additionally, a sleeve adds a lot of bulk to the size of a normally slim PDA.
The main producer of Pocket PC and Palm sleeves is Navman. Expect to spend around $200–$250 for a GPS sleeve. Find more about these products at www.navman.com.
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