Possible Clues:

• Where on board is his damp problem?
• Toward the centre of the vessel
• I�d pass him stumbling towards centre of vessel . . .
• Towards centre of large boat
• In centre of vessel
• His maps I’d put in a mess somewhere on board
• I hid spasm, shaken to the core on board
• Director in mishap is unsettling central position on board
• Halfway through schooner, surrounded by drink?
• At the centre of a boat