Today’s technology provides the modern mariner with a variety of marine electronics to choose from, and many of the latest marine devices come fully integrated with GPS-capable electronics. GPS does more than help you navigate to your destination. One of the most powerful features of GPS is that it allows you track where you have been and get back there safely. It also allows you to set waypoints for significant finds along the way. You can set a waypoint for a tricky piece of land that juts out below water (and thus avoid it) or mark the spot of a detected wreck, a beautiful coral reef or a great fishing spot.
Much like sonar technology, which bounces sound waves off objects below the surface of the water, marine GPS devices use high-frequency low-power radio signals emitted from satellites in orbit around the Earth to determine your position on the water. When these signals hit your GPS receiver, the receiver calculates an x-y coordinate marking your position. Combine the accuracy of your marine GPS with other marine electronics capabilities, such as a fish finder or a chart plotter and you have a powerful tool to aid you in your quest for the best fish, exploring deep sea wrecks, or simply trying to navigate a rocky coastline on a Sunday afternoon.
An automotive GPS overlays the x-y coordinates of a vehicle on the maps of the United States and other countries. This is how it knows exactly where you are and can guide you to another location. Marine GPS electronics use various contour maps …

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