I am planning on riding the TAT this summer and I need some sort of GPS. I had a bit of GPS phone app experience for car navigation (Mapquest) and trail running (MotionX) but zero experience with dedicated units. While researching for the TAT trip it seemed like the go-to unit was the Montana so I picked up one of those at an REI sale more than a year ago. I am technologically challenged in all ways and learning the Montana was no different. The short version of the story is I had zero success at figuring out anything at all with the Garmin. I did learn, however, that a cell phone App would work quite nicely- infinitely easier and much cheaper than the Garmin. I tried a few Apps and went with the one that appeared to be the easiest to use- fewest features and simplest operation- Gaia. I bought their top $40/ year version and sold my Garmin (was able to use that money to buy a pair of SIDI Adventure Gore Tex boots). From some of the threads and posts I've seen here outlining the types of things some folks do with their GPS's (they read to me like a pHd dissertation in electrical engineering) I think the features on Gaia are very basic, but basic is all I need. I can: -Find tracks out on the WWW and email them to my phone then open them up in Gaia. They magically appear on the Gaia map and are saved in the file folder. -Rename, change color, and hide/show any of the saved tracks -Record any track I ride then share that with anyone via email or AirDrop if another iPhone is close by. -Quickly and easily create a route right on the screen with my finger. Useful to reroute around some block in the primary route or to navigate off route for some reason. -Select from about 10 different topo, road, and forest service maps to show individually or layered on the screen. -Save custom maps on the phone for use out of cell service I am currently running this on my iPhone 6s (64 GB memory). The phone is in a waterproof, shock resistant Lifeproof Nuud case and is mounted on my bike's handlebars with a RAM mount (I forgot which one.) When on the bars it is plugged into a usb charger. It will charge fully even with the screen up full bright and running several Apps. I have seen reports that some phones will drain battery even when plugged into the charger if too many things are running on the phone, that is not my experience with my 6s. I now have 2700 miles on the bike with this set-up on the bars. More than half of that is off-road. About half of that off-road mileage is pretty aggressive technical single-track. I have had it in the rain. I have crashed and dumped the bike many, many times. I have bent the handle bars at least once. Throughout all of that I have had no problem at all with the security, safety, function. or mounting of the phone. I did a 5 day trip last August where the daily afternoon temps were in the middle to upper 90's with full sun. I never had an issue with the phone shutting down due to heat. Having said that, however, I am on a Honda crf 250 L that has no wind screen. I am pretty sure the air flow without a screen makes a big difference in those temps. If the phone is hidden from air flow behind a screen I could imagine overheating problems happening in that kind of heat but I don't know. My phone has not shut down. -While it is definitely true that the phone's screen is not as bright in full sun as a Montana type device, it CAN be read. If you hold them side by side in full sun the difference is huge. BUT you can still see the phone's screen, it does not become invisible. So the bottom line is it still does the job. -Touch sensitivity. I do not have gloves that function on the phone's screen. I personally don't like to frig around with that kind of stuff when riding anyway so it is not that important to me, I just stop if I need to mess with the GPS. One of my riding partners does have gloves that work with his iPhone so I will probably look into getting a pair, but it isn't that big of a deal for how I ride. -The phone's GPS is at least as accurate as other's dedicated units I have been around. I have never seen it's map position to be more than 30 feet off from where I was really positioned on the ground. It is often closer than that. This includes under heavy tree cover with no cell service- (GPS only). Pros: -Cheap cheap cheap. You already have the phone. Or you still have your last model in a drawer somewhere. Or you can buy a perfectly good one on eBay for less than $100. A GPS unit like a Montana starts at like $400 and go up from there. Apps are free or just a few bucks. -Connectivity. I have no idea how a Montana type device connects to the outside world (need a computer with you?) but we all know how a phone does it, cell or wi-fi, no extra device needed. -Ease of use. I could not for the life of me figure out how to use the Montana. I have huge respect for those of you who understand and/or can figure out how to use a stand alone GPS. I can't, I am stupid. But I can figure out how to use the App on the phone. In fact it was easy. It made me feel smart. Good luck with whatever you go with.