KOEN
Gravelly Shoal Light in the middle, with the lights within 20 km, in their listed colours.
Gravelly Shoal Light — light characteristic, height, range
One red flash every 6 seconds
Count 6 seconds.Flash red, once.Begin again.
- Characteristic
- Fl R 6s
- Height
- 75 ft · 23 m
- Nominal range
- 10 mi = 16 km
- Structure
- White square tower on cylindrical base.
- Remarks
- HORN: 1 blast ev 30s (3s bl). Operates continuously.
- Position
- 44.0198°N, 83.5384°W · MI
Lights nearby
- Charity Island Shoal Lighted Buoy 3One green flash every 4 seconds · 4.6 km
- Northport Marina Entrance Lighted Buoy 2One red flash every 2.5 seconds · 9.5 km
- Northport Marina Entrance Lighted Buoy 1One green flash every 2.5 seconds · 9.6 km
- Au Gres Harbor North Pier Light 4One red flash every 2.5 seconds · 10 km
- Au Gres Harbor South Pier Light 3One green flash every 4 seconds · 10 km
- Charity Island Shoal Lighted Buoy 1Continuous quick green flashes · 10 km
- U.S. Gypsum Tramway Light NOne yellow flash every 4 seconds · 18 km
- U.S. Gypsum Tramway Light JOne white flash every 4 seconds · 18 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).
Sources: U.S. Coast Guard Light List (opens in a new tab) · Checked