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10.3 GPS Devices

There are two main types of GPS
receivers on the market at the moment:

Plain GPS receivers

GPS receivers with maps

A plain
GPS receiver simply interprets the readings from the satellite and
returns the result in latitude, longitude, and altitude. Figure 10-5 shows the
PocketMap
(http://www.pocketmap.com)
PMG-220 Compact Flash (CF) GPS
receiver. You can use the PMG-220 on a handheld or your notebook
computer (which may require a PCMCIA adapter for the CF card).

Figure 10-5. The PocketMap PMG-220 CF GPS receiver with a CF-to-PCMCIA adapter

Figure 10-6 shows the Deluo Laptop GPS receiver.
This is an affordable receiver ($99) that's
available from Deluo (http://www.deluo.com) in serial or USB
configurations. We used the Deluo USB model in our testing for this
chapter.

Figure 10-6. The Deluo Laptop GPS receiver

Figure 10-7 shows two standalone
GPS receivers equipped with
their own mapping software. The Magellan Meridian Gold and the
Garmin StreetPilot III contain built-in
screens to display maps. There is no need to connect the receivers to
any device for them to work. Standalone GPS receivers are useful for
travelers who need a lightweight GPS solution.

Figure 10-7. The Magellan Meridian Gold GPS (left) and the Garmin StreetPilot III (Magellen used by permission, Thales Navigation, Inc. 2003; Garmin courtesy of Garmin Ltd.)