As GPS technology has progressed over the years the size of handheld GPS units has shrunk while performance and power have increased. This is good news for outdoor enthusiasts such as backpackers, bikers, cross-country skiers, and geocachers. These pocket sized units will help you find your way, keep track of where you are, and show you the way back to where you came from. There are two general classifications of handheld GPS units. The first is a dedicated unit that is strictly a GPS receiver. This type of unit includes multiple screens that show you everything from the direction you are traveling to how long it’s going to take you to get to your destination. The Magellan Triton handheld is this type of unit. The other type of handheld GPS is an add-on to a PDA. In essence this is a piece of hardware that plugs-in to the PDA and gives it GPS functionality. This can be a nice add-on but you do need to be aware that these plug-ins tend to be bulky and take up space, something you do not need to worry about with a dedicated GPS unit. Here are some things to think about if you are considering buying a handheld GPS system. The first thing to consider is how and where you intend to use it. This is important because getting a GPS signal to your receiver from orbiting satellites is dependent on line of site. If you spend a lot …