A boat came up close behind us, so I pulled over to let him overtake. I have recently read up on how to do this correctly. The manoeuvre is initiated by the leading boat moving over to the port side, the following boat can then follow their normal (‘keep right’) line as they pass. Any unexpected appearance of an oncoming craft is resolved by the slower moving boat slowing further. I don’t think the boater behind us appreciated the subtlety, but he told us it was his first day out and he was pleased to already be overtaking.