The Fastnet Race takes place every two years over a course of 608 nautical miles (1,126 km). The race starts off at Cowes on the Isle of Wight on the south coast of England at the Royal Yacht Squadron. Leaving The Solent through The Needles Channel, the race follows the southern coastline of England westward down the English Channel, before rounding Land's End. After crossing the Celtic Sea, the race rounds the Fastnet off the southwest coast of Ireland. Returning on a largely reciprocal course, the race rounds the Isles of Scilly before finishing at Plymouth.

The Fastnet is a challenging race. Taking place in August, the race is often provided with Westerlies that are strong to gale force in strength. The succession of low pressure systems which advance on Ireland and Britain across the North Atlantic Ocean provide a constantly moving weather pattern for which Fastnet navigators must plan. These depressions are mostly centered north of the English Channel. Knowledge of where meteorological disturbances are likely to occur, and how best to use them, is the keynote to success in the race.

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