Chapter IV of the International Convention for the safety of Life at Sea (SOLAS) & the regulations of the International Telecommunicaton Union (ITU) require that all GMDSS ships keep a radio log in a specified format & that certain items are recorded therein. This radio log book must be kept close to the radio installation & must be completed & retained onboard for inspection by any authorized person. The master of the ship is required to review the entries in this radio log on a daily basis & to countersign Section C of the log book to this effect.