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I have always been real good about knowing where I am going. I usually spend countless hours pouring over maps and planning routes. After that, I usually have those map images burned into my head pretty good and I can visualize them and see in my mind where I am on those maps, so long as I am near other reference points on the map that I can recognize, like a town, specific intersection, etc... So I wouldn't get lost. However, I really like the ability to see exactly where I am on the map relative to other stuff, like different parts of the route. I like being able to find other stuff on the fly around my route if needed when I am in an unfamiliar area, like food, lodging, gas, etc,... So it is not "mission critical", but it is convenient. I still wander off and explore roads on a whim while out riding. If I find anything exceptionally interesting, I can drop a waypoint marker on the map in a few seconds so that I can easily located it again if desired.
