Boating Coach
Communication and distressQuestion 366 of 566

Why should you keep charts on board if you have a marine GPS?

  1. The GPS can fail.
  2. The law says you cannot use GPS alone.
  3. A GPS cannot show your position in a lake.
  4. Charts are needed to start the GPS.
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Correct answer: The GPS can fail.

A GPS is an electronic tool and it can stop working. Charts are your back-up.

Source: Safe Boating Guide (TP 511E, 2026), GPS (Global Positioning Systems), page 50

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Questions last reviewed: 18 October 2026