Without a doubt, the most commonly asked question I get from divers has to do with reading and using GPS coordinates. This is not surprising since a GPS coordinate can be represented in so many different ways. Books, magazines, and online sources often display coordinates differently, some using a notation that includes values represented as pure decimal numbers, others using a notation that includes minutes and seconds of degrees. And some use NORTH, SOUTH, EAST, and WEST indicators, while others use plus and minus symbols instead. I've even seen books that list coordinates one way on some pages, and other ways on other pages -- within the same chapter!
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