The rules can be found here:

http://www.sailspeedrecords.com/ind...amp;view=article&id=88&Itemid=28

One item of note for the 500metre course:
"The course may be defined by posts and transits ashore (Transits shall not converge), or by WSSRC approved GPS survey equipment."

Cheshirecatman

Also of note:

"Calculation

For all courses offshore and the course of distance run in 24 hours, coordinates shall be in latitude and longitude using the WGS84 datum, and distances will be calculated as the great circle on a sphere on which 1 minute of latitude = 1 nautical mile.

For the calculation of distances on the courses of half a kilometre and one nautical mile, GPS coordinates supplied to the WSSRC shall be in latitude and longitude using the WGS84 datum. The WSSRC will calculate the distance as the length of a geodesic on the WGS84 ellipsoid using the Vincenty method."

Last edited by Cheshirecatman; 10/01/09 08:39 AM.