I purchased this GPSMAP76 because it was one of the models that would allow me to load free maps of MN snowmobile trail system.  If you're thinking of buying one for this, here are some things to consider:  First, I have never used a gps for this purpose so I was not sure what to expect, but the MN DNR snowmobile trail map file (can download for free from their website) is not too bad.  I've ridden about 300 miles with this gps now, and have found a few instances where the map is out of date.  That's no fault of the gps, just local clubs not keeping the DNR informed of changes.  Unlike Auto GPS which is pretty intuitive, there is a learning curve to this thing, so you should be prepared to spend several hours playing with it to get the hang of it before you intend to actually use it.  It's best to turn off all functions that you don't really need, to keep the screen from being cluttered.  Turn off the map that it comes with, so that only the snowmobile map is shown.  You will absolutely NEED to zoom in/out OFTEN, so get very aquainted with that feature!  I keep my zoom set @ 0.5 miles while I'm riding to show when a curve, or small variation in the trail is coming up.  Then, when I get to a intersection and I'm not sure which way to go, I zoom out to about 5 miles which means that you actually have about a 20X30 mile map on the screen so you can see towns and which trail leads where (make sure you have the town setting turned on).  YOU WILL NEED TO CAREFULLY THINK OF HOW/WHERE TO MOUNT THIS because you need it mounted very, very solid if you expect to read it while you're moving (not to mention keeping it from flying off).  I first mounted mine on the dash behind the windshield, but found that it was too far away to see and had to always lean ahead uncomfortably to push buttons, etc.  Then I made a mount for the handlebars so that it's right in front of me and I can look at the screen straight-on.  Much better, but again, that mount absolutely MUST be rock-solid!  I had to make my own mount because I could not find anything solid enough.  Have a metal-fab guy make a mount for you using a pipe-clamp (not hose clamp) for the handlebars.  My only real complaint about the gps itself, is that I wish the screen was easier to see at times (there is still a glare depending on how the sun is shining)  Oh, by the way, I don't often ride at night, but if you do...the backlight on this unit can be set to stay on for a MAXIMUM of just a few minutes, so you'll have to keep pushing the "light" button to keep the screen visible at night (saves battery life I guess).
I purchased this GPSMAP76 because it was one of the models that would allow me to load free maps of MN snowmobile trail system. If you're thinking of buying one for this, here are some things to consider:  First, I have never used a gps for this purpose so I was not sure what to expect, but the MN DNR snowmobile trail map file (can download for free from their website) is not too bad. I've ridden about 300 miles with this gps now, and have found a few instances where the map is out of date. That's no fault of the gps, just local clubs not keeping the DNR informed of changes. Unlike Auto GPS which is pretty intuitive, there is a learning curve to this thing, so you should be prepared to spend several hours playing with it to get the hang of it before you intend to actually use it. It's best to turn off all functions that you don't really need, to keep the screen from being cluttered. Turn off the map that it comes with, so that only the snowmobile map is shown. You will absolutely NEED to zoom in/out OFTEN, so get very aquainted with that feature! I keep my zoom set @ 0. 5 miles while I'm riding to show when a curve, or small variation in the trail is coming up. Then, when I get to a intersection and I'm not sure which way to go, I zoom out to about 5 miles which means that you actually have about a 20X30 mile map on the screen so you can see towns and which trail leads where (make sure you have the town setting turned on). YOU WILL NEED TO CAREFULLY THINK OF HOW/WHERE TO MOUNT THIS because you need it mounted very, very solid if you expect to read it while you're moving (not to mention keeping it from flying off). I first mounted mine on the dash behind the windshield, but found that it was too far away to see and had to always lean ahead uncomfortably to push buttons, etc. Then I made a mount for the handlebars so that it's right in front of me and I can look at the screen straight-on. Much better, but again, that mount absolutely MUST be rock-solid! I had to make my own mount because I could not find anything solid enough. Have a metal-fab guy make a mount for you using a pipe-clamp (not hose clamp) for the handlebars. My only real complaint about the gps itself, is that I wish the screen was easier to see at times (there is still a glare depending on how the sun is shining)  Oh, by the way, I don't often ride at night, but if you do... the backlight on this unit can be set to stay on for a MAXIMUM of just a few minutes, so you'll have to keep pushing the "light" button to keep the screen visible at night (saves battery life I guess).