#### 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.