What is an excellent tool to determine your distance off land?

What is an excellent tool to determine your distance off land?

• A. Radar
• B. Sonar
• C. GPS
• D. Spotting

Answer: (A)

Radar is the most direct and reliable way to measure how far you are from the shore. Marine radar displays show the coastline on the screen and you can read the distance from the range scale or use built-in range rings to gauge your separation from land. This works in all visibility conditions—fog, rain, night—because it relies on radio waves, not your eyes. Sonar looks underwater, so it doesn’t help with distance to land above the surface. GPS can give your coordinates, and you could compute distance to shore, but that requires extra steps and knowledge of the shoreline’s location; it isn’t a direct readout of distance to land. Spotting by eye is far less precise, especially in rough seas or low visibility.

Radar is the most direct and reliable way to measure how far you are from the shore. Marine radar displays show the coastline on the screen and you can read the distance from the range scale or use built-in range rings to gauge your separation from land. This works in all visibility conditions—fog, rain, night—because it relies on radio waves, not your eyes. Sonar looks underwater, so it doesn’t help with distance to land above the surface. GPS can give your coordinates, and you could compute distance to shore, but that requires extra steps and knowledge of the shoreline’s location; it isn’t a direct readout of distance to land. Spotting by eye is far less precise, especially in rough seas or low visibility.