But were afraid to ask
For anyone in any doubt about any questions of flag etiquette at sea or ashore, the Flag Institute is a 500-member vexilollogical organisation with its headquarters at 38 Hill Street, Mayfair, London. The institute maintains the William Crampton Library in Kingston Upon Hull in the north-east of England, comprising over 40,000 flag related volumes and publishes a quarterly 24 page full colour journal, Flagmaster, and a virtual magazine called eFlags.