From the CHM site (
http://www.henney.com/chm/1200/ ):
156.85 VHF 17 DC Harbor Patrol
157.05 VHF 21 DC Coast Guard
Also worth throwing in additional regional CG freqs which likely would get frequent use down that way 156.8, 157.1, 157.075, 157.125, 157.15, 157.175, 345.000, 237.9, 326.15, 379.05.