Measurement of Heading

GPS can't measure the boat's heading and can measure only the COG. Once the GPS receiver is moving, because it can determine COG, it knows the direction of true north. We will find, later in this book, that some instruments, such as radar and chartplotters, can make use of heading information to allow the display to be aligned with north to give a north up display. Although GPS can provide this information, there are two disadvantages: The information is available only once the boat is in motion and the alignment is based on COG rather than which way the boat is pointing.

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