From that angle, it's really tough to tell the distance from the mark for that first port boat, ...
Mike,
Very good. That is precisely why photographic evidence is treated with skepticism in the protest room. It is often difficult to determine the actual position of boats from a photo, unless the photographer's position is just right.
I'll stipulate that the first starboard/port encounter took place outside the zone. Rhetorically speaking however, does that make any difference in this situation?