A line of boats on starboard approaches a seawall obstruction. The first boat reaches where they have to call for water and tack. There are a line of more starboard boats comming up the course. The boat that tacked is now on port. Once they complete their tack are they immediately forced to give way to all the starboard boats, or is there some leeway room etc.

This question came up from a stadium type racing situation, where it was a very short distance on starboard after the start before the pin boat was forced to tack. All the boats were essentialy still lined up, so the first boat to tack and all tacking boats could effectively be pinned in behind the entire fleet.