Can you describe a little more what the course would cover?
I've always felt I knew how to use my GPS pretty well. I turn it on, it shows me where I am. I can scroll around if I want, I can enter a destination point, and I can even enter an intermediate destination point if I want.
I'm sure there are some features I'm not using, but I've never felt like I needed "GPS Training".
I don't mean to knock your course, it might very well be that I don't know what I don't know.
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