Racing 2021 — Notice to Competitors — Mark Coördinates and Racing Area Changes
As of Jul 7th
The racing area for all series races have moved. The new racing area shall be centred at mark O, located approximately 1 nautical mile at 25° magnetic from the end of the Pike Creek Channel on Lake St. Clair.
Mark O is the start mark for the Open Series and for the Thursday-night Fall Series.
Mark 4 will be the start mark for the Monday Series. It is four tenths of a nautical miles at 75° magnetic from the end of the Pike Creek Channel.
| Mark | Latitude | Longitude |
| O | 42º20.406'N | 82º50.231'W |
| 1 | 42º21.003'N | 82º49.618'W |
| 2 | 42º20.506'N | 82º49.229'W |
| 3 | 42º19.951'N | 82º49.427'W |
| 4 | 42º19.662'N | 82º50.096'W |
| 5 | 42º19.809'N | 82º50.844'W |
| 6 | 42º20.306'N | 82º51.233'W |
| 7 | 42º20.861'N | 82º51.035'W |
| 8 | 42º21.150'N | 82º50.366'W |
Marks 1-8 will form an octagon, with each mark placed 0.75 nautical miles from mark 0.