Entrance to Three Mile Harbor: LAT. 41° 02.20'N, LON 72° 11.35'W.
Follow the channel markers from the entrance of Three Mile Harbor to the southern end of the harbor. On your port side will be a peninsula with a sign for Gardiner's Marina, Green Can #37 ( LAT 41° 00.117N, LON 72° 11.000W). Navigate around this peninsula within the channel markers to channel marker GM1 marking the entrance to Gardiner's Marina (LAT 41° 00.116N, LON 72° 10.932W).
Take Route 495 west to the Manorville Expressway, which will bring you to Route 27 east to East Hampton. At traffic light with the historic Town Pond in front of you, make a left. Now on Main Street, go straight through light in center of town. Immediately after light, bear left at the fork onto North Main Street, then bear left at the next fork onto Three Mile Harbor Road. Travel approximately 2.5 miles. Gardiner's Marina is located on the left at 35 Three Mile Harbor Hog Creek Road.