In the next column, I will discuss the pros and cons of ENC vs. This is one more reason to lay the route out on a computer and then transfer it to the onboard system, because the internal charts of dedicated GPS systems are all vector-based. actual graphic image of the printed chart (called RNC, for raster navigation chart) rather than on a vector chart (called ENC, for electronic navigation chart). If I might insert here an easily defendable bias, the electronic route layout is usually best done with a “real e-chart,” i.e. Then, when your final list of waypoints is made and checked, you can transfer the list to your onboard navigation system using methods we discuss here. These programs (including many free or open source versions) have better graphics and view options than any dedicated onboard system, not to mention that many show tides and currents as a function of time to help plan the route. The easiest way to lay out a route is to select and then fine tune the waypoints on an e-chart program on your computer rather than enter them directly into the onboard GPS. There are many reasons these days to transfer navigation data among GPS and e-chart devices. Your best bet for nav data transfer (published November 2012)
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