Summary: I do like the large screen my laptop provides for navigation. the small screened navigators are a hazard to me. Other than having to deal with Garmin, their customer service is as bad as it comes, the product does what it is advertised. It locks on to the sats fast and acurately.
Summary: The USB version of this GPS receiver is the usual high quality of a Garmin unit, but it does connect to a computer in an unexpected way, so be careful when buying this unit. Most "hockey puck" USB GPS receivers create a COM port on the computer, which makes them very compatible with mapping programs and other GPS software applications. The Garmin 18 USB creates a new DEVICE in the Windows Device Manager and does not generate a COM port for your use.
Summary: This is not a haldheld but for use in a car or other vehicle. Works perfectly. Drove all around in Florida using this. The fault with using a laptop as a navigational tool is that it is a fraction slower than the dedicated units so when the computer says 100 meters to next turn you have managed to drive a large part of that distance Baldur