Navigation General · Special Marks & Ranges
Two fixed structures in line define a range. When a vessel is on the range centerline, the front and rear range marks appear:
- ASide by side
- BVertically aligned, one directly above the other✓ Correct
- CBlinking alternately
- DSeparated by exactly 5 degrees of arc
Explanation
When on the range bearing, the forward (lower) mark and the rear (higher) mark appear vertically in line — one directly above the other. Deviation from the line causes them to appear offset.
Authority: 33 CFR 62 (U.S. ATON System)
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