Summary: Use the GPS for trail mapping with Google Earth, just works great, easy to use and way better then the newer touch screen model ! The rock'n roller makes it easy to use also with gloves or cold finger !
Summary: Garmin really tried to produce a superior product with their Colorado series, and in some ways they did, but after their best efforts the line has been discontinued. Why? Colorado has a bigger screen with higher resolution than the map60 series (more pixels) and needs more backlight. Combine that with more features than anyone really needs and you've got a real battery-gobbler. A 10-hour battery life is about average from alkaline through NiMH to Lithium.
Summary: Nice device. Haven't tried it out seriously yet, but as much as i was waiting from it, i got that all. I like the diplay, i like the controls (in my opinion much better than touch screen), fast zooming, and good memory capacity even without memory card. One thing that not realy nice, that screen seemed for mee pretty dark without backlight, maybe its because of bad screen shield? donno.
Summary: I bought the Colorado 400c as a manufacturer refirbished unit. Great price and one year warranty, you get free shipping and if you buy from some one out of state you save the taxs also. Yes the owners manuel is lacking, but after playing with the menues you can figure it out. It has the g2 maps, the same as in the built in or add on fish finder/GPS units, just fits in your hand. Love the way it shows all your way points at once.
Summary: The Garmin Colorado 400c: I use the unit as a heart monitor, on my bicycle, and on the water for navigation. It fits my usage quite nicely. It can be seen in sunlight. Its only real negative is the back lighting is not very bright. I agree with others who have noted the previous lighting issue. Overall I would recommend the unit largely because of its versatility.
Summary: I have owned the Colorado 400C for 2.5 months and use it on a sailboat going less than 8 mph. The 2 problems are 1) the speed jumps all over the place second by second when going that slow so it is useless for sailing needs (I wonder if the ETA, ... are inaccurate) and 2) the map display and cursor/track up only works correctly if the GPS is lying horizontal (if the GPS is vertical the cursor moves down & sideways).
Summary: I am used to a Garmin GPS 48 so this is a change. The mapping is great, but the unit is missing some marine data in a format that I am used to, with regard to Crosstrack error (now it is in feet or tenths of a mile with no indication of which side of the course) and with regard to seeing distance to mark, crosstrack error, bearing to mark and course to mark all at once on a runway format) That is missing, the data can be found in other places however, but it requires...
Summary: I just returned from a 150-mile sail on the Maine coast using the 400c as our primary navigation tool. I installed the marine mount on the cabin top under the dodger and hard-wired it into the boat's 12v system using the accessory cord, which doubles the brightness compared to battery power, so it was readable in all conditions under the dodger shade.