Captain's Brief · Maritime Learning · 2 min read · Oct 21, 2026
Photo: Niels Johannes, CC BY-SA 4.0, via Wikimedia Commons.
Load Line Marks and World Load Line Zones Explained
What do the marks on a ship's side mean, and which one can you load to? T, S, W, WNA, F and TF each match a zone, a season or the water density. The zone and the date decide which mark applies, and it must not be submerged on departure, on passage or on arrival. Source: ICLL 1966/88 Annex I and II.
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