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Navigating reef shoals: reading a nautical chartplotter while underway

By Lauren Landers Sailing

The boat's smartphone-based nautical chartplotter shows a plotted magenta course line threading through reef shoals, with a current depth reading of 32.2 ft and speed over ground of 5.38 knots. Using a dedicated marine GPS navigation app like this allows the crew to monitor real-time telemetry and stay on a safe route through shallow, reef-strewn water, which is especially critical in French Polynesian atolls where depths change quickly.

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