Isles of Shoals Light — light characteristic, height, range

One white flash every 15 seconds

Count 15 seconds.Flash white, once.Begin again.

Characteristic: Fl W 15s
Height: 82 ft · 25 m
Nominal range: 14 nmi = 26 km
Structure: White conical tower.
Remarks: Emergency light of reduced intensity when main light is extinguished. HORN: 1 blast ev 30s (3s bl). 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 45 minutes.
Position: 42.9672°N, 70.6233°W · NH

Isles of Shoals Light in the middle, with the lights within 20 km, in their listed colours.

Lights nearby

UNH Hampton Beach Spotter Lighted Research BuoyOne yellow flash every 2.5 seconds · 7.2 km
EOM Offshore Research Lighted Buoy AOne yellow flash every 4 seconds · 7.7 km
Gunboat Shoal Lighted Bell Buoy 1One green flash every 4 seconds · 8.8 km
Rye Harbor Entrance Lighted Whistle Buoy RHMorse A (·−) in white · 9.1 km
UNH Isle of Shoals CO2 Research Lighted BuoyOne yellow flash every 4 seconds · 9.1 km
UNH AirSea Lighted Research BuoyOne yellow flash every 4 seconds · 10 km
Rye Harbor Light 4One red flash every 6 seconds · 10 km
Kitts Rocks Lighted Whistle Buoy 2KROne red flash every 2.5 seconds · 11 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).