Marine GPS: 5 Fast Facts

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Fact #1. The Global Positioning System was originally created for military and government intelligence applications. It's a network of satellites that orbit the Earth in fixed points. They beam signals down to anyone using a GPS receiver, no matter where on the planet they're located.
Fact #2. Marine navigation is making the marine transportation world safer and more efficient. It's easy for landlubbers to believe that GPS navigation is only a necessity when large ships are out at sea with no land in sight to use as a reference. However, this isn't true. It makes navigating congested waterways and harbors safer. It's more critical as large ships pull into port, when the risk of crashing into other ships and hazards is elevated.
Fact #3. Marine GPS units come in all shapes and sizes. This can make picking the right one difficult for those new to using them. Before choosing a unit, it's best to consider a few factors. First, check the manufacturers specifications to see how many satellites the device uses. Low cost models may only use 12 satellites, which is enough to function properly. A 24 satellite system will be notably more accurate.
Fact #4. You should consider if you prefer a handheld unit or one that mounts to the boat's dash. If you have a small boat or dinghy, a handheld model is probably sufficient. It can be difficult for some to read the screen of smaller units. They also generally have reduced mapping capabilities. Larger mounted receivers are good for those who like looking at a large, color screen and want to see a lot of details. Many are also compatible with a fish finder and depth sounder.
Fact #5. Some marine GPS systems, particularly handheld versions, are considered non-mapping. This means they show a compass, a latitude, and longitude to help you determine your position, but not an actual map. If you want to see a map displayed on the screen, choose a mapping system.