Third across the line - wait a minute

Last night was the third and final rumble of the season. We made a poor start, but caught the others in our group quickly. Two times round the course and we crossed the line third. Wait a minute, confusion. Look at the charts, there are two different red #2 at Spectacle island. Mark M was announced and was told to be Red#2 at Spectacle. Later we checked the long list of marks - M is red #2 north of Thompson island, west of Spectacle. We weren't the only to screw up. Will pay more attention this weekend at the Flip-Flop Regatta.  Winds predicted to to be 2 kts - ouch