Distances between the club race marks are provided in the following table.  The overall distance for a race can be approximated by adding the leg distances.

HdGYC CLUB MARKS (distances in nautical miles)
ABCDEFGHZ
A0.140.140.500.871.170.750.530.28
B0.140.090.430.841.030.660.390.23
C0.140.090.360.761.040.610.420.15
D0.500.430.360.430.850.270.420.22
E0.870.840.760.431.040.410.830.61
F1.171.031.040.851.040.650.640.99
G0.750.660.610.270.410.650.480.48
H0.530.390.420.420.830.640.480.42
Z0.280.230.150.220.610.990.480.42

As an example of how to use the table, consider Race 4 of the 2016 Summer Series, which had a Spin course posted of BEZ2, and was started from the dock, at Z.  So the individual six course legs are Z to B, B to E, E to Z, Z to B, B to E, and E to Z.  From the table, the six leg distances are: 0.23, 0.84, 0.61, 0.23, 0.84, and 0.61 for a total distance of 3.36 nm.

Coordinates for club marks are:

Z:  N 39 degrees 32.771′  W 076 degrees 04.936′

G:  N 39 degrees 32.426′  W 076 degrees 04.495′

H:  N 39 degrees 32.899′  W 076 degrees 04.415′

F:  N 39 degrees 32.596′  W 076 degrees 03.680′