These days, global positioning systems can be found in justabout every car and phone in the country. They're extremely popularbecause they provide expert, step by step navigation. StandaloneGPS units can cost $300, or more, however, and they vary greatly inquality.Finding a good global positioning system requires research. Oneof the most important things to look at is whether the phone offersa good selection of points of interest, often abbreviated inproduct descriptions as POI. Most global positioning systems have abuilt in database of points of interest, so it's very important tochoose one with an extensive and up to date list. Points ofinterest are often arranged by category, for instance food, gas,and hotels. They can be updated regularly in some instances byhooking a GPS unit up to a