HA(+)
Class notation for hatches designed for heavy cargo.
HC-A
Class notation for vessels designed to take full cargo deadweight with some (defined) cargo holds empty.
HC-B
Class notation for bulk carriers with a cargo density of above 1.0 t/m³ in all holds.
HC-B*
Strengthened to carry dry bulk cargoes with cargoes of density 1.0 t/m³ and above with any hold empty at maximum draught.
HC-C
Class notation to carry dry bulk cargo with a density of less than 1.0 t/m³ in all cargo holds.
HC-M
Class notation for vessels intended for carrying dry cargoes in bulk.
HELDK
Helicopter landing area or erected platform covering basic strength requirements.
HELDK-F
Additional requirements to helicopter facilities. Can be assigned in combination with S and H.
HELDK-H
Additional requirements to helicopter safety Can be assigned in combination with S and F.
HELDK-S
Additional requirements to ship safety. Can be assigned in combination with H and F.
HL(ρ)
Special features notation for vessels designed for 100% filling of specified tanks with a heavy liquid, where ρ = density of the liquid in t/m³.
HMON-(...)
Instrumentation system for monitoring of hull behaviour where (...) denotes additional supplements which denote amount and type of monitoring equipment: A, C, D, E, G, H, L, M, N, O, P, S, T, W.
Holds n may be empty
Holds may be empty at full draught where n is the identification number for each hold that may be empty.
HOT
Class notation for ships intended to carry liquid cargo at a temperature higher than 80°C and at atmospheric pressure.