it helps you find your way to a place that you want to go.
Information about Car GPS Systems can be found online on websites, such as GPS Top Ten Reviews, Consumer Reports and Consumer Search. These websites contain reviews and useful information about Car GPS Systems.
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I don't know if I would use it in a car, but on a boat, or an airplane, it seems as though it would be useful. I think a laptop is a bit much for a car ride, but I hear they are pretty accurate and keep good GPS locks for the whole trip.
Why is any car useful? Your question makes no sense.
Many car GPS devices have a mode for walking. They're great for navigating new cities. There are also portable GPS devices intended for runners and outdoor hobbyists.
This GPS location finder can save the coordinates of a location, then uses satellite triangulation to guide you back to that location. It is most useful for finding your way back to your car, hotel, or camp. Not like a car navigation.
Having car with GPS allows a driver to have easy access to directions no matter where they travel. A car GPS can direct you to places you haven't been, or show you the shortest route to a destination. It helps to keep your hands free and your eyes on the road versus having to use a paper map.
A GPS, or Global Positioning System can usually be used to find its own position on the planet Earth, with great precision. This is particularly useful for the person currently holding the GPS, or if the GPS is being used as a tracking device, for the people tracking the GPS. Often the GPS will be used in conjunction with software that displays the current position on a world-map and also sometimes with directions to a customize-able destitution. This makes the GPS useful for navigation in different situations. When included in a mobile phone the GPS becomes even more useful because it will be portable and less likely to be forgotten.
Magellan is just the name of a company that makes brands of GPS systems. They make car, handheld, and mobile GPS navigation systems and they are used the same way as any other brand of GPS systems.
Teletype is a company who makes car navigation systems or GPS systems. This is a system that can help you to navigate to a certain destination that you have typed into the system.
Car GPS systems are highly accurate providing there is no road construction or detours since you last updated/Synced the device to the servers. Most GPS have automatic updating or even streaming updating which makes arriving at the wrong destination unlikely.
A GPS will work anywhere it can receive adequate signals, and assuming you have a decent antenna, any GPS will work in an airplane. However, a GPS that is not programmed for aviation uses will not be nearly as useful as one that is. A car GPS or trekking GPS may give you lat/long readouts, which may be of some use in an aircraft, but they will be of limited use for a flight.