UPDATE: This model has been discontinued.
The Garmin Oregon 450t is one of the newest members of the touchscreen Oregon family, featuring the latest improvements such as better visibility, a tri-axial compass, custom dashboards, advanced track navigation features and the ability to load custom maps and BirdsEye aerial imagery. It also includes pre-loaded 1:100,000 scale topos of the entire US. I’ll delve into those details shortly, but first I want to clarify the differences between the Oregon 450t and some closely…
The 
is probably Garmin’s most popular entry-level marine handheld. This greyscale unit floats and can accommodate up to 8MB of added maps. Its pre-loaded basemap brings marine navigation aids, including lights, buoys, sound signals and day beacons. 
is one of the newest members of the touchscreen Oregon family, featuring the latest improvements such as better visibility, a tri-axial compass, custom dashboards, advanced track navigation features and the ability to load 
The 
is a GPS-enabled cycling computer. It does not have the navigation functions available on some other members of the Edge series, though like certain models, it can be paired with a heart rate monitor and power meter. Here’s a bit more detail on how it compares to some…
is a new introduction designed to do one thing well – geocache! It has a 2.2” color (non-touch) screen, 18 hour (rated) battery life and a highly detailed worldwide basemap. And while it isn’t designed for backcountry navigation, it can accommodate 500 waypoints and a 5,000 point tracklog. Really though, the eXplorist GC is a one-trick pony aimed at geocachers, with a low and sure to be discounted MSRP of $199.99.
is a new entry-level unit with a 3.5” screen, text-to-speech, 3 million points of interest and pre-loaded maps of the US. But what really makes the EASE attractive is the fact that it includes IQ Routes, TomTom’s historical road speed database that can make for significantly improved routing. This feature is not included in many other low-price TomTom models, so I was quite pleased to see it included on the EASE.
The 
is a relatively high-end unit in the 1xxx series line up, offering a luxurious five-inch screen and advanced features such as multi-destination routing, lane assist and junction view.
UPDATE: A new model, the 
sports one of the largest screens available of any after-market navigation device — a whopping seven inches! Clearly aimed at truck and RV drivers, the 1700 also offers lane assist and multi-destination routing. 
UPDATE: This model has been discontinued. For current recommendations, please refer to our 
The 
is a bit unusual. This wrist-mounted unit isn’t a full-fledged sportswatch, nor does it have the feature set found in some of the nicer handheld GPS receivers. It’s probably best suited for folks wanting to minimize the weight of backcountry gear and have the unit conveniently available.