Boat Crewman Practice Test 2026 - Free Boat Crewman Practice Questions and Study Guide

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Ranges are indicated by the symbol for lights and a dash line indicating the direction.

Dash line only

Dash line with the light symbol

Ranges are shown using two lights along the desired safe line, with a dash line that indicates the direction of that line. The light symbols at the ends identify the actual aids you should see, and the dashed line shows how they align to mark the safe passage. When your vessel is positioned so the two lights line up with that dashed direction, you’re in the range and should follow the channel.

If you only had a dash line, you wouldn’t know which lights you’re supposed to look for. A solid line or a dotted circle represents other chart features, not this range indication. So the correct depiction is a dash line together with the light symbols.

Solid line

Dotted circle