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Foreflight supports these three GPS units at this time. They all retail for around $99. Bad Elf GPS for iPad Nobody has anything bad to say about it. Rated 4 or 5 stars by all but one or two people on Amazon and Sporty’s. I’ve used this one in two planes and it works fine. [...]

Why is there a difference between the magnetic variation for the airport and the VOR located at the same airport? When a navaid is first constructed, the antenna is physically oriented to True North. Then a potentiometer adjustment is made to slave the navaid with Magnetic North. This action matches the isogonic line making it [...]

Most textbooks cover navigating with VORs pretty well. These links cover some additional ground. VOR Navigation Part I VOR Navigation Part II VOR Navigation Part III VOR Approaches Part I VOR Approaches Part II The ILS System