INT 1 · J 13.2
Kelp or heavy weed
DangersRegional
Branching frond symbols show kelp or weed at or near the surface.
What it means
Branching frond-like marks identify kelp or heavy weed. The exact density and seasonal extent can differ from the chart.
Why it matters
Kelp can foul propellers and anchors and often indicates rock below. Treat it as a regional warning, not a precise vegetation boundary.