NavCard is an SD card with NAVTEQ street maps of the entire contiguous U.S. and GPS capability built-in for use with a GPS unit such as the iGold SDIO GPS, which, if you have a Zodiac with 2 expansion SD slots, you can use simultaneously with no antennas or pucks necessary. NavCard uses the intuitive interface of the desktop Mapopolis software, allowing search, route finding and directions on your Palm as well as voice prompts for routes. Display is overhead map view, with extensive zooming and focus capacity. iGolf SDIO GPS is an add-in SD expansion containing an all-inclusive, self-powered (internal battery with power draw from Palm) GPS with internal antenna. Tester was impressed with ability to maintain signal lock inside a car and with ease of use. Both devices received an A rating from reviewer and come highly recommended. NavCard is also available without GPS capability for $99.