1-347 Conversely, the ship's trade may require an intensive succession of port calls, demanding long hours and limited rest: coastal ships of all types, ferries and containerships and parcel tankers during the loading or discharging period are typical examples. The type and tarde (and manning level) of different ships and ships on different trades will have a direct on the senior officer's ability to carry out addition management tasks over and above routine operational tasks. Il is important that the ship manager understands this if co-operation between ship and office is to be effective.