What is Parallel Index Line?
Parallel Index Line A radar-derived reference line drawn parallel to the vessel's intended track, used to monitor cross-track error by keeping a chosen land echo or seamark at a constant offset.
Source: IMO SMCP, STCW Convention, SOLAS, COLREG
How is “Parallel Index Line” Used in Practice?
Pilot: Keep the starboard parallel index line one cable off the 20-metre contour; adjust rudder as necessary to maintain constant offset.
Certification Exam Relevance
Who Needs to Know This Term?
- Deck Officers
- Engine Officers
- Masters
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What is Parallel Index Line?
A radar-derived reference line drawn parallel to the vessel's intended track, used to monitor cross-track error by keeping a chosen land echo or seamark at a constant offset.
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