Trearddur Bay Sailing Club - 2026

Course Selector Matrix

Choose the column for the magnetic bearing the wind is blowing from. The race officer should still shorten or alter courses for visibility, sea state, traffic and other operational concerns.

Download the original matrix (PDF)

Official selector

Very short, short and long courses

TBSC Course Selector Chart 2026 showing very short, short and long courses by magnetic wind bearing

On a phone, turn the screen sideways or scroll across the matrix to read each bearing column.

Race-management check

Potential fleet and mark conflicts

1. Same mark rounded in opposite directions

Yes. The combinations below send two fleets around at least one shared mark in opposite directions.

Long135° magnetic

Misc - Course 25 (port) and 1/2 Rater - Course 14R (starboard).

Shared mark: Channel.

2. Same mark used at different parts of the course

Yes. The analysis found 73 fleet/course combinations across 51 course-length and bearing selections. These fleets round in the same direction, but may reach the shared mark at different stages or a different number of times.

Show the complete wind-direction and course list
Very short030° magnetic

Feva - Course 3 and Misc - Course 9.

Shared mark reached at different course stages: Green Bay.
Very short030° magnetic

Slow Misc - Course 5 and Misc - Course 9.

Shared mark reached at different course stages: Glazebrook.
Very short030° magnetic

Slow Misc - Course 5 and 1/2 Rater - Course 9.

Shared mark reached at different course stages: Glazebrook.
Very short030° magnetic

Myth - Course 5 and Misc - Course 9.

Shared mark reached at different course stages: Glazebrook.
Very short030° magnetic

Myth - Course 5 and 1/2 Rater - Course 9.

Shared mark reached at different course stages: Glazebrook.
Very short045°, 060° magnetic

Feva - Course 3R and Misc - Course 9R.

Shared mark reached at different course stages: Green Bay.
Very short045°, 060° magnetic

Myth - Course 5R and Misc - Course 9R.

Shared mark reached at different course stages: Glazebrook.
Very short045°, 060° magnetic

Myth - Course 5R and 1/2 Rater - Course 9R.

Shared mark reached at different course stages: Glazebrook.
Very short075° magnetic

Feva - Course 3R and Misc - Course 20R.

Shared mark reached at different course stages: Green Bay.
Very short090° magnetic

Feva - Course 2R and Misc - Course 20R.

Shared mark reached at different course stages: Green Bay.
Very short105°, 120° magnetic

Slow Misc - Course 7R and Misc - Course 13R.

Shared mark reached at different course stages: Lagoon.
Very short105°, 120° magnetic

Myth - Course 7R and Misc - Course 13R.

Shared mark reached at different course stages: Lagoon.
Very short195°, 210° magnetic

Feva - Course 3R and Misc - Course 10R.

Shared mark reached at different course stages: Green Bay.
Very short240° magnetic

Feva - Course 3 and Misc - Course 17.

Shared mark reached at different course stages: Green Bay.
Very short255° magnetic

Feva - Course 3 and Misc - Course 20.

Shared mark reached at different course stages: Green Bay.
Very short270° magnetic

Feva - Course 2 and Misc - Course 20.

Shared mark reached at different course stages: Green Bay.
Very short285°, 300° magnetic

Feva - Course 2 and Misc - Course 19.

Shared mark reached at different course stages: Green Bay.
Very short315°, 330° magnetic

Feva - Course 2 and Misc - Course 14.

Shared mark reached at different course stages: Green Bay.
Short015° magnetic

Optimist - Course 3 and Slow Misc - Course 10.

Shared mark reached at different course stages: Outer Bay.
Short015° magnetic

Optimist - Course 3 and Myth - Course 10.

Shared mark reached at different course stages: Outer Bay.
Short030°, 240° magnetic

Optimist - Course 3 and Slow Misc - Course 9.

Shared mark reached at different course stages: Outer Bay.
Short030°, 240° magnetic

Optimist - Course 3 and Myth - Course 9.

Shared mark reached at different course stages: Outer Bay.
Short045°, 060° magnetic

Optimist - Course 3R and Myth - Course 9R.

Shared mark reached at different course stages: Outer Bay.
Short045°, 060° magnetic

Feva - Course 5R and Myth - Course 9R.

Shared mark reached at different course stages: Glazebrook.
Short045°, 060° magnetic

Feva - Course 5R and Misc - Course 9R.

Shared marks reached at different course stages: Glazebrook, Green Bay.
Short045°, 060° magnetic

Slow Misc - Course 5R and Myth - Course 9R.

Shared marks reached at different course stages: Glazebrook, Outer Bay.
Short045°, 060° magnetic

Slow Misc - Course 5R and Misc - Course 9R.

Shared mark reached at different course stages: Glazebrook.
Short075° magnetic

Optimist - Course 3R and Slow Misc - Course 8R.

Shared mark reached at different course stages: Outer Bay.
Short075° magnetic

Optimist - Course 3R and Myth - Course 8R.

Shared mark reached at different course stages: Outer Bay.
Short090° magnetic

Optimist - Course 2R and Slow Misc - Course 8R.

Shared mark reached at different course stages: Outer Bay.
Short090° magnetic

Optimist - Course 2R and Myth - Course 8R.

Shared mark reached at different course stages: Outer Bay.
Short105°, 120° magnetic

Optimist - Course 2R and Slow Misc - Course 7R.

Shared mark reached at different course stages: Outer Bay.
Short105°, 120° magnetic

Optimist - Course 2R and Myth - Course 7R.

Shared mark reached at different course stages: Outer Bay.
Short105°, 120° magnetic

Feva - Course 7R and Misc - Course 13R.

Shared marks reached at different course stages: Lagoon, Green Bay.
Short105°, 120° magnetic

Slow Misc - Course 7R and Misc - Course 13R.

Shared mark reached at different course stages: Lagoon.
Short105°, 120° magnetic

Myth - Course 7R and Misc - Course 13R.

Shared mark reached at different course stages: Lagoon.
Short195°, 210° magnetic

Optimist - Course 3R and Slow Misc - Course 10R.

Shared mark reached at different course stages: Outer Bay.
Short195°, 210° magnetic

Optimist - Course 3R and Myth - Course 10R.

Shared mark reached at different course stages: Outer Bay.
Short255° magnetic

Optimist - Course 3 and Slow Misc - Course 8.

Shared mark reached at different course stages: Outer Bay.
Short255° magnetic

Optimist - Course 3 and Myth - Course 8.

Shared mark reached at different course stages: Outer Bay.
Short270° magnetic

Optimist - Course 2 and Slow Misc - Course 8.

Shared mark reached at different course stages: Outer Bay.
Short270° magnetic

Optimist - Course 2 and Myth - Course 8.

Shared mark reached at different course stages: Outer Bay.
Short285°, 300° magnetic

Optimist - Course 2 and Slow Misc - Course 7.

Shared mark reached at different course stages: Outer Bay.
Short285°, 300° magnetic

Optimist - Course 2 and Myth - Course 7.

Shared mark reached at different course stages: Outer Bay.
Short315° magnetic

Feva - Course 11 and Misc - Course 14.

Shared mark reached at different course stages: Green Bay.
Short330° magnetic

Feva - Course 12R and Misc - Course 26R.

Shared mark reached at different course stages: Green Bay.
Long015° magnetic

Optimist - Course 6 and Myth - Course 10.

Shared mark reached at different course stages: Outer Bay.
Long015° magnetic

Feva - Course 10 and Slow Misc - Course 13.

Shared mark reached at different course stages: Ravenspoint.
Long015° magnetic

Slow Misc - Course 13 and Myth - Course 10.

Shared marks reached at different course stages: Ravenspoint, Outer Bay.
Long030° magnetic

Optimist - Course 6 and Myth - Course 9.

Shared mark reached at different course stages: Outer Bay.
Long030° magnetic

Slow Misc - Course 13 and Myth - Course 9.

Shared mark reached at different course stages: Outer Bay.
Long045°, 060° magnetic

Optimist - Course 5R and Feva - Course 9R.

Shared mark reached at different course stages: Glazebrook.
Long045°, 060° magnetic

Optimist - Course 5R and Slow Misc - Course 9R.

Shared marks reached at different course stages: Glazebrook, Outer Bay.
Long045°, 060° magnetic

Optimist - Course 5R and Myth - Course 9R.

Shared marks reached at different course stages: Glazebrook, Outer Bay.
Long075°, 090° magnetic

Optimist - Course 4R and Feva - Course 8R.

Shared mark reached at different course stages: Smellie.
Long075°, 090° magnetic

Optimist - Course 4R and Slow Misc - Course 8R.

Shared marks reached at different course stages: Smellie, Outer Bay.
Long075°, 090° magnetic

Optimist - Course 4R and Myth - Course 8R.

Shared marks reached at different course stages: Smellie, Outer Bay.
Long105°, 120° magnetic

Optimist - Course 6R and Slow Misc - Course 7R.

Shared mark reached at different course stages: Outer Bay.
Long105°, 120° magnetic

Optimist - Course 6R and Myth - Course 7R.

Shared mark reached at different course stages: Outer Bay.
Long135° magnetic

Feva - Course 12 and Misc - Course 25.

Shared mark reached at different course stages: Green Bay.
Long195° magnetic

Feva - Course 13R and Misc - Course 18R.

Shared mark reached at different course stages: Green Bay.
Long210° magnetic

Optimist - Course 6R and Slow Misc - Course 10R.

Shared mark reached at different course stages: Outer Bay.
Long210° magnetic

Optimist - Course 6R and Myth - Course 10R.

Shared mark reached at different course stages: Outer Bay.
Long225°, 240° magnetic

Optimist - Course 5 and Feva - Course 9.

Shared mark reached at different course stages: Glazebrook.
Long225°, 240° magnetic

Optimist - Course 5 and Slow Misc - Course 9.

Shared marks reached at different course stages: Glazebrook, Outer Bay.
Long225°, 240° magnetic

Optimist - Course 5 and Myth - Course 9.

Shared marks reached at different course stages: Glazebrook, Outer Bay.
Long255°, 270° magnetic

Optimist - Course 4 and Feva - Course 8.

Shared mark reached at different course stages: Smellie.
Long255°, 270° magnetic

Optimist - Course 4 and Slow Misc - Course 8.

Shared marks reached at different course stages: Smellie, Outer Bay.
Long255°, 270° magnetic

Optimist - Course 4 and Myth - Course 8.

Shared marks reached at different course stages: Smellie, Outer Bay.
Long285°, 300° magnetic

Optimist - Course 6 and Slow Misc - Course 7.

Shared mark reached at different course stages: Outer Bay.
Long285°, 300° magnetic

Optimist - Course 6 and Myth - Course 7.

Shared mark reached at different course stages: Outer Bay.
Long315° magnetic

Feva - Course 12R and Misc - Course 25R.

Shared mark reached at different course stages: Green Bay.
Long315° magnetic

Misc - Course 25R and 1/2 Rater - Course 24R.

Shared mark reached at different course stages: Deadman's.