How do you create a route on roads or trails that are not on your GPS map, and still have your GPS "tell you" when a turn is coming? How do you create a route where there is no road? How do you show a bunch of very twisty trails that each requires more than 500 points to depict it in the detail you want? How do you share a route with others who have different Garmin units or different maps, and have their route take the same path as your route? How do you designate on the screen that one route is "easy" and another route is "hard"? How do you show all possible planned routes on the screen at one time (in an area where there are several trail options)? What do you have to do to ride a route backwards, or if you have to turn around and backtrack your route midway along it? What do you have to do to transfer from one route to the next when the beginning of one is at the same place as the end of another? The way my buddies and I plan and ride, routes would be 100% useless, and a custom made map IMG serves us perfectly.