| ACRONYM | FULL WORDING | COMMENT |
| HA | Hatches | (See HO) |
| HDLTS | Half Despatch on Laytime Saved | Clearer than the following |
| HDWTS ... | Half Despatch on Working Time Saved cf.: DHD ... | |
| HH, H/H | Holds/Hatches | For instance : 5H/5H or 2H/4H |
| HO | Holds | For instance : 2HO /4HA |
| HRS | Hours | |
| HSS | Heavy Grain Sorghums and/or Soyabeans | Traditionally wheat and maize are " heavy grain " even when their density falls below that of barley which is always a " light " grain |
| HVF | Heavy Fuel ou High Viscosity Fuel | Viscosity of such fuels is at least 380 cst (their density is close to 1) |
| HW | High Water | See also : NT (Neap Tide) |
