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Radar revision module 3 of 9

EBL

Range, Bearing, VRM, and EBL

Using range rings, variable range markers, electronic bearing lines, and radar fixes.

range ringsVRM

4 guided lessons · 8 practice questions · 8 flashcards

3 outcomes · self-guided revision
  • Explain using range rings, variable range markers, electronic bearing lines, and radar fixes.
  • Apply range rings to a realistic onboard situation.
  • Recall the core check: range is distance from own vessel to the echo.

A self-guided revision companion that explains essential concepts, then helps you practise and test them. It supports—but does not replace—recognised instruction, practical training, assessment or certification. Access is a one-time payment, not a subscription.

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Lesson routeRange and Bearing as Evidence0/1 read

Lesson 1 of 1

Range and Bearing as Evidence

Radar is strongest when it turns a vague echo into measured evidence. Range tells distance from own vessel; bearing tells direction; repeated range and bearing tell whether the situation is changing safely.

The mistake is treating a single range and bearing as a full answer. Collision avoidance and fixing usually need repeated observations or another source of confirmation.

  • Range is distance from own vessel to the echo.
  • Bearing is direction to the echo.
  • Repeated measurements show movement trends.
  • Use radar measurements with the chart and visual references where possible.
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