If you plan on using your GPS in an automobile, there are several choices: a basic or mapping handheld receiver; a dedicated automotive receiver; a GPS with a PDA; or a Laptop GPS.Although handheld units can be used in a car there are several disadvantages-the screen can be hard to see due to its small size and some units will need to be placed forward on the dashboard where they can get a better signal. With a basic (non-mapping) unit you can tell where you are as long as you have a paper map with you to interpret that data.A mapping unit is the more useful choice considering with driving usually involves roads. A dedicated automotive receiver is larger than a handheld in order to accommodate a screen large enough to be seen while driving.

A GPS with a PDA needs clear access to the sky for satellite reception. Some receivers have the antenna built in or have the capability for an external antenna. An antenna on the seat of your car may or may not work. The console is the next best place - reception may be questionable. An air vent mount is better and a windshield mount or the antenna placed all the way forward on the dashboard is better yet. The most reliable place is for an external antenna to be attached to the roof of your car.A laptop GPS requires a CF with an external antenna, a Bluetooth GPS receiver, a mouse-type GPS receiver, or be connected via a cable to a handheld GPS unit so the receiver can be placed in a position for good reception. Of course a laptop is large, but the main advantage is a very large screen for maps. If you have a need for a laptop in your car, this may be the best choice and a mouse-type receiver is inexpensive.

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