The Graves Light — light characteristic, height, range

2 white flashes every 12 seconds

Count 12 seconds.Flash white, 2 times.Begin again.

Characteristic: Fl (2)W 12s
Height: 98 ft · 30 m
Nominal range: 14 nmi = 26 km
Structure: On light gray conical granite tower.
Remarks: Emergency light of reduced intensity when main light is extinguished. HORN: 2 blasts ev 20s (2s bl-2s si-2s bl-14s si). MRASS-Fog signal is radio activated, during times of reduced visibility, turn marine VHF-FM radio to channel 83A/157.175Mhz. Key microphone 5 times consecutively, to activate fog signal for 60 minutes.
Position: 42.3649°N, 70.8691°W · MA

The Graves Light in the middle, with the lights within 20 km, in their listed colours.

Lights nearby

The Graves Lighted Whistle Buoy 5One green flash every 4 seconds · 1.5 km
Boston South Channel Entrance Lighted Buoy 1Continuous quick green flashes · 2.3 km
Three and One-Half Fathom Ledge Lighted Bell Buoy 2One red flash every 4 seconds · 2.7 km
Boston Approach Lighted Buoy BGMorse A (·−) in white · 2.9 km
Boston South Channel Lighted Buoy 5One green flash every 4 seconds · 3.6 km
Boston South Channel Lighted Buoy 6One red flash every 4 seconds · 3.8 km
Boston North Channel Lighted Buoy 3Continuous quick green flashes · 3.8 km
Boston North Channel Lighted Bell Buoy 2Continuous quick red flashes · 4.2 km

Not for navigation. Use official NOAA charts and USCG Local Notices to Mariners.

Real periods; the phase is reconstructed from a fixed clock (real lights don't keep time with each other).