When Global Positioning System (GPS) units first came on the scene back in the mid-1990's, they didn't offer much: they'd display a text list of latitude/longitude coordinates, or in some advanced cases a crude grayscale map. Now, they're a lot more friendly, offering color screens, touchscreen interfaces, and network with databases of nearby attractions.
You can use GPS to trek through the woods, get driving directions, navigate an airplane, track exercise statistics...the possibilities are endless (even unmanned spacecraft now use GPS to fly automatically). Once you have one, you'll wonder how you lived without it.
In this guide, we'll give you an overview of different types of GPS units and their features, then help you find the perfect GPS. Ready? Let's go.
