A "Predicted Log Race" is, in fact, not a race at all. It's a contest that measures the navigation ability of the captain and crew. A prescribed course is assigned for all participants to follow. The participant first plots the course to compute the distance of each leg and then computes the time to run each leg. The participants predicted times are submitted to the race committee before the race. The crew is not permitted any timing devices during the race with the exception of the prescribed timed runs. An observer is assigned who carries the only clock and records the times made good. After the race, the predicted times are compared with the actual times and scored by dividing the total seconds error by the predicted time.

This race included currents which had to be calculated into the predicted run times. Depending on the current, a correction to the heading also has to be taken into consideration. In addition, this prescribed course included four timed runs, for which the crew is allowed to use a stopwatch for these legs only.