ACHIAS SEAL IS.S (C)
MAIN DUCK IS. (C)
MAKAPUU POINT
MANATEE RIVER LIGHT 24A
MANISTEE N. PIERHEAD
MANISTIQUE
MANITOU
MANITOWOC BREAKWATER
MATINICUS ROCK
MARBLEHEAD LIGHT MASS
MARBLEHEAD LIGHT OHIO
MARQUETTE HARBOR
MARQUETTE BREAKWATER OUTER
MARSHALL POINT
MARTIN REEF
MATAGORDA SHIP CHANNEL ENT.
MAUMEE BAY ENT. LIGHT 2
MENOMINEE PIER LIGHT 6
MIAH MAULL SHOAL LIGHT ON NORTH END OF SHOAL.
MICHIGAN CITY EAST PEER
MICHIGAN IS.
MICHIPICOTEN HARBOR (C)
MIDDLE IS.
MILE ROCKS
MILWAUKEE BREAKWATER
MILWAUKEE PIERHEAD
MINNEAPOLIS SHOAL
MINOTS LEDGE
MOBILE POINT
MOLOKAI IS.
MONHEGAN IS.
MONTAUK POINT
MOOSE PEAK
MORRO BAY W. BREAKWATER
MOUNT DESERT
MUKILTEO
MUNISING CITY PIER

NA: MACHIAS SEAL IS.S (C)
DT: ME - FIRST DISTRICT
CT: NEW BRUNSWICK - GRAND MANAN CHANNEL SOUTHERN PART
IN: 1090
LL: 44 30 06N 67 06 06W
CH: FL W 3S
HT: 82
RG: 17
DM: WHITE OCTAGONAL TOWER, RED TOP. 60
RM: EM. LIGHT WHEN MAIN LIGHT IS EXTINGUISHED. HORN: 2 BLASTS EV 60S (3S BL).

NA: MAIN DUCK IS. (C)
DT: LAKE ONTARIO
CT: CLAYTON TO FALSE DUCK IS.
IN: 2585
LL: 43 55 54N 76 38 18W
CH: FL W6S
HT: 77 23
RG: 20
DM: WHITE OCTAGONAL TOWER WITH RED UPPER PORTION.
RM: SEASONAL. EM. LIGHT.

NA: MAKAPUU POINT
DT: HI - FOURTEENTH DISTRICT
CT: OAHU IS.
IN: 28925
LL: 21 18 36N 157 38 59W
CH: OC W 10S
HT: 420
RG: 19
DM: WHITE CYLINDRICAL CONCRETE TOWER. 46
RM: OBSCURED WEST OF 011D, AND MAY BE OBSCURED WESTWARD OF 154D BY POINTS NORTHWARD OF LIGHT. LIGHTED THROUGHOUT 24 HOURS. EM. LIGHT OF REDUCED INTENSITY WHEN MAIN LIGHT IS EXTINGUISHED. OPERATES DURING PERIODS OF DARKNESS ONLY.

NA: MANATEE RIVER LIGHT 24A
DT: FL - SEVENTH DISTRICT
CT: TAMPA BAY ENTRANCE
IN: 22080
LL:
CH: FL R 2.5S
HT:
RG: 14
DM: TR ON PILE.
RM:

NA: MANISTEE N. PIERHEAD
DT: LAKE MI
CT: MANISTEE HARBOR
IN: 18450
LL: 44 15 07N 86 20 49W
CH: ISO W 6S
HT: 55 17
RG: 15
DM: WHITE CYLINDRICAL TOWER. 39
RM: HORN: 1 BLAST EV 15S (2S BL). OPERATES FROM APR. 1 TO NOV. 1.

NA: MANISTIQUE
DT: LAKE MI
CT: DUTCH JOHNS POINT TO FISHERY POINT
IN: 21475
LL: 45 56 42N 86 14 48W
CH: ISO R6S
HT: 50 15
RG: 11
DM: ON TOWER.
RM: HORN: 1 BLAST EV 30S (3S BL). OPERATES FROM MAY 1 TO OCT. 20.

NA: MANITOU
DT: LAKE SUPERIOR
CT: BIG BAY POINT TO REDRIDGE
IN: 15170
LL: 47 25 12N 87 35 12W
CH: FL W10S
HT: 81 25
RG: 18
DM: CYLINDRICAL TOWER. 80
RM: RACON: M (- -). HORN: 2 BLASTS EV 30S (2S BL-2S SI-2S BL-24S SI). OPERATES YEAR ROUND.

NA: MANITOWOC BREAKWATER
DT: LAKE MI
CT: MANITOWOC AND SHEBOYGAN
IN: 20860
LL: 44 05 34N 87 38 37W
CH: ISO W 6S
HT: 52 16
RG: 15
DM: ON CYLINDRICAL TOWER ON FOG SIGNAL BUILDING.
RM: HORN: 2 BLASTS EV 30S (2S BL-2S SI-2S BL-24S SI). OPERATES FROM APR. 1 TO DEC. 1.

NA: MARQUETTE HARBOR
DT: LAKE SUPERIOR
CT: MARQUETTE AND PRESQUE ISLE HARBORS
IN: 14630
LL: 46 32 48N 87 22 36W
CH: FL W 10S  
HT: 77 23
RG:
DM: Red square tower on dwelling.
RM:

NA: MARQUETTE BREAKWATER OUTER
DT: LAKE SUPERIOR
CT: MARQUETTE AND PRESQUE ISLE HARBORS
IN: 14635
LL:
CH: OC W4S (R SECTOR)
HT: 36 11
RG: W12 R9
DM: WHITE CYLINDRICAL TOWER WITH RED BAND.
RM: RED FROM 181D TO 198D. HORN: 1 BLAST EV 15S (2S BL). OPERATES FROM MAY 1 TO OCT. 20. OPERATES BY KEYING THE MIKE 5 TIMES ON VHF-FM CH. 79.

NA: MARSHALL POINT
DT: ME - FIRST DISTRICT
CT: MUSCONGUS BAY
IN: 4780
LL: 43 55 03N 69 15 41W
CH: F W  
HT: 30
RG: 13
DM:
RM: EM. LIGHT OF REDUCED INTENSITY WHEN MAIN LIGHT IS EXTINGUISHED. LIGHTED THROUGHOUT 24 HOURS. HORN: 1 BLAST EV 10S (1S BL).

NA: MARTIN REEF
DT: LAKE HURON
CT: DE TOUR PASSAGE TO WAUGOSHANCE POINT
IN: 12205
LL: 45 54 48N 84 08 54W
CH: AL WR10S
HT: 65 20
RG: 13
DM: WHITE SQUARE TOWER ON CONCRETE CRIB.
RM: HORN: 1 BLAST EV 30S (3S BL). OPERATES YEAR ROUND.

NA: MATAGORDA SHIP CHANNEL ENT.
DT: TX - EIGHTH DISTRICT
CT: MATAGORDA BAY
IN: 25950 1305
LL: 28 25 18N 96 19 06W
CH: FL W 10S
HT: 57
RG: 14
DM: ON SAME STRUCTURE AS MATAGORDA SHIP CHANNEL RANGE B REAR LIGHT.
RM: OBSCURED FROM 257D TO 040D.

NA: MATAGORDA SHIP CHANNEL ENT.
DT: TX GULF COAST - EIGHTH DISTRICT
CT: GALVESTON TO RIO GRANDE
IN: 1305 25950
LL: 28 25 18N 96 19 06W
CH: FL W 10S
HT: 57
RG: 14
DM: ON SAME STRUCTURE AS MATAGORDA SHIP CHANNEL RANGE B REAR LIGHT.
RM: OBSCURED FROM 257D TO 040D.

NA: MATINICUS ROCK
DT: ME SEACOAST - FIRST DISTRICT
CT: BAY OF FUNDY TO CAPE COD
IN: 3195
LL: 43 47 01N 68 51 18W
CH: FL W 10S  
HT: 90
RG: 20
DM:
RM: EMERGENCY LIGHT OF REDUCED INTENSITY WHEN MAIN LIGHT IS EXT. HORN: 1 BLAST EV 15S (2S BL). OPERATES CONTINUOUSLY.

NA: MAUMEE BAY ENT. LIGHT 2
DT: LAKE ERIE
CT: TOLEDO HARBOR
IN: 6050
LL: 41 49 30N 83 11 36W
CH: FL R 2.5S
HT: 44 13
RG: 13
DM: TR ON TOWER WITH RED BAND.
RM: RACON: M (- -) BELL: 1 STRIKE EV 30S. HORN: 1 BLAST EV 15S (1S BL). STANDBY SIGNAL. OPERATES YEAR ROUND.

NA: MENOMINEE PIER LIGHT 6
DT: LAKE MI
CT: MENOMINEE AND MARINETTE HARBORS
IN: 21940
LL:
CH: F R
HT: 59 18
RG: 12
DM: ON RED SKELETON TOWER.
RM:

NA: MIAH MAULL SHOAL LIGHT ON NORTH END OF SHOAL.
DT: NJ AND DE - FIFTH DISTRICT
CT: DE BAY
IN: 1585
LL: 39 07 36N 75 12 36W
CH: OC W 4S (R SECTOR)
HT: 59
RG: W15 R12
DM: RED CONICAL TOWER, ON GRAY CONICAL PIER; RED CYLINDRICAL WATCH ROOM AND BLACK LANTERN.
RM: RED FROM 137.5D TO 333D, COVERS BRANDYWINE SHOAL AND CROSS LEDGE. RACON: M(- -) EM. LIGHT OF LOWER INTENSITY WITH SAME CHARACTERISTIC AS MAIN LIGHT WHEN MAIN LIGHT IS EXTINGUISHED. HORN: 1 BLAST EV 10S (1S BL). MAINTAINED FROM MAR. 15 TO DEC. 15.

NA: MICHIGAN CITY E. PIERHEAD
DT: LAKE MI
CT: WAUKEGAN TO SOUTH HAVEN
IN: 19545
LL: 41 43 42N 86 54 42W
CH: OC W 4S  
HT: 55 17
RG: 12
DM: WHITE OCTAGONAL TOWER WITH RED ROOF ATTACHED TO FOG SIGNAL BUILDING. 49
RM: MAINTAINED FROM APR. 1 TO NOV. 1. HORN: 2 BLASTS EV 30S (2S BL-2S SI-2S BL-24S SI).

NA: MICHIGAN IS.
DT: LAKE SUPERIOR
CT: APOSTLE IS.
IN: 15275
LL: 46 52 18N 90 29 48W
CH: FL W 6S  
HT: 170 52
RG: 11
DM: WHITE CYLINDRICAL TOWER. 102
RM:

NA: MICHIPICOTEN HARBOR (C)
DT: LAKE SUPERIOR
CT: GRAND PORTAGE BAY TO SHESHEEB POINT
IN: 16855
LL: 47 56 36N 84 54 24W
CH: FL W 30S
HT: 88 27
RG: 18
DM: SKELETON TOWER. 40
RM: SEASONAL. HORN: 2 BLASTS EV 60S (3S BL). HORN POINTS 210D. OPERATES BY KEYING MIKE 5 TIMES ON VHF-FM CH. 19. EM. LIGHT.

NA: MIDDLE IS.
DT: LAKE HURON
CT: HARRISVILLE TO FORTY MILE POINT
IN: 11515
LL: 45 11 36N 83 19 18W
CH: FL W 10S
HT: 78 24
RG: 17
DM: WHITE CONICAL TOWER WITH ORANGE BANDS IN MIDDLE WITH DWELLING DETACHED. 71
RM:

NA: MILE ROCKS
DT: CA - ELEVENTH DISTRICT
CT: ENTRANCE TO SAN FRANCISCO BAY
IN: 4245 365
LL: 37 47 34N 122 30 37W
CH: FL W 5S
HT: 49
RG: 15
DM: WHITE CAISSON WITH ORANGE BANDS.
RM: HORN: 1 BLAST EV 30S (2S BL). OPERATES CONTINUOUSLY.

NA: MILE ROCKS
DT: CA - ELEVENTH DISTRICT
CT: POINT SUR TO SAN FRANCISCO
IN: 365 4245
LL: 37 47 34N 122 30 37W
CH: FL W 5S
HT: 49
RG: 15
DM: WHITE CASSION WITH ORANGE BANDS.
RM: HORN: 1 BLAST EV 30S (2S BL). OPERATES CONTINUOUSLY.

NA: MILWAUKEE BREAKWATER
DT: LAKE MI
CT: MILWAUKEE HARBOR
IN: 20635
LL: 43 01 37N 87 52 55W
CH: FL R 10S
HT: 61 19
RG: 14
DM: BLACK LANTERN ON WHITE SQUARE STRUCTURE. 53
RM: STRUCTURE IS FLOODLIGHTED FROM SUNSET TO SUNRISE. SUBMARINE CABLE RUNS TO MILWAUKEE PIERHEAD LIGHT. ILLUMINATED SIGN ON CHANNELWARD SIDE OF LIGHT STRUCTURE WORDED CABLE CROSSING NO ANCHORING. HORN: 2 BLASTS EV 20S (2S BL-2S SI-2S BL-14S SI). OPERATES FROM APR. 1 TO NOV. 1.

NA: MILWAUKEE PIERHEAD
DT: LAKE MI
CT: MILWAUKEE HARBOR
IN: 20670
LL:
CH: FL R 4S
HT: 45 14
RG: 12
DM: TR ON CYLINDRICAL TOWER. 41
RM:

NA: MINNEAPOLIS SHOAL
DT: LAKE MI
CT: DUTCH JOHNS POINT TO FISHERY POINT
IN: 21610
LL: 45 34 54N 86 59 54W
CH: FL W 5S
HT: 82 25
RG: 16
DM: ON WHITE SQUARE TOWER WITH RED STRIPE.
RM: RACON: M(- -) HORN: 1 BLAST EV 30S (3S BL). OPERATES FROM MAY 1 TO OCT. 20.

NA: MOBILE POINT
DT: AL - EIGHTH DISTRICT
CT: MOBILE BAY
IN: 4960 245
LL: 30 13 42N 88 01 30W
CH: FL W 10S
HT: 125
RG: 24
DM: ON SKELETON TOWER.
RM:

NA: MOBILE POINT
DT: AL GULF COAST - EIGHTH DISTRICT
CT: MOBILE BAY
IN: 245 4960
LL: 30 13 42N 88 01 30W
CH: FL W 10S
HT: 125
RG: 24
DM: ON SKELETON TOWER.
RM:

NA: MOLOKAI IS.
DT: HI - FOURTEENTH DISTRICT
CT: HI TO OAHU
IN: 28575
LL: 21 12 34N 156 58 11W
CH: FL W 10S
HT: 213
RG: 21
DM: ON WHITE TOWER. 138
RM: LIGHTED THROUGHOUT 24 HOURS. EM. LIGHT OF REDUCED INTENSITY WHEN MAIN LIGHT IS EXTINGUISHED. OPERATES DURING PERIODS OF DARKNESS ONLY.

NA: MONHEGAN IS.
DT: ME - FIRST DISTRICT
CT: MUSCONGUS BAY
IN: 4925 20
LL: 43 45 53N 69 18 57W
CH: FL W 15S
HT: 178
RG: 20
DM:
RM: WITHIN 3 MILES OF ISLAND THE LIGHT IS OBSCURED BETWEEN WEST AND SOUTHWEST. EM. LIGHT OF REDUCED INTENSITY WHEN MAIN LIGHT IS EXTINGUISHED.

NA: MONHEGAN IS.
DT: ME SEACOAST - FIRST DISTRICT
CT: BAY OF FUNDY TO CAPE COD
IN: 20 4925
LL: 43 45 53N 69 18 57W
CH: FL W 15S
HT: 178
RG: 20
DM:
RM: WITHIN 3 MILES OF ISLAND THE LIGHT IS OBSCURED BETWEEN WEST AND SOUTHWEST. EM. LIGHT OF REDUCED INTENSITY WHEN MAIN LIGHT IS EXTINGUISHED.

NA: MARBLEHEAD MASS
DT: SEACOAST (MASSACHUSETTS) - FIRST DISTRICT
CT: GEORGES BANK AND NANTUCKET SHOALS (CHART 13200)
IN: 10450
LL: 42 30 18N 70 50 00W
CH: F G  
HT: 130
RG: 7
DM: SQUARE SKELETON TOWER; BROWN TO GALLERY, BLACK ABOVE.
RM:

NA: MARBLEHEAD OHIO
DT: LAKE ERIE
CT: SOUTH SHORE OF LAKE ERIE (CHART 14842)
IN: 5250
LL: 41 32 12N 82 42 42W
CH: FL G 6S  
HT: 67
RG: 11
DM: TOWER.
RM:


NA: MINOTS LDEDG
DT: SEACOAST (MASSACHUSSETTS) - FIRST DISTRICT
CT: GEORGES BANK AND NANTUCKET SHOALS (CHART 13200)
IN: 440
LL: 41 16 12N 70 45 30W
CH: FL(1+4+3) W 45S 1.5S FL 5S EC 1.5S FL 1.5S EC 1.5S FL 1.5S EC 1.5S FL 1.5S EC 1.5S FL 5S EC 1.5S FL 1.5S EC 1.5S FL 1.5S EC 1.5S FL 15S EC
  
HT: 85
RG: 10
DM: ON GRAY CONICAL TOWER.
RM: HORN: 1 BLAST EV 10S (1S BL).

NA: MONTAUK POINT
DT: NY SEACOAST - FIRST DISTRICT
CT: APPROACHES TO NY - NANTUCKET SHOALS TO FIVE FATHOM BANK
IN: 660
LL: 41 04 15N 71 51 26W
CH: FL W 5S  
HT: 168
RG: 18
DM:
RM: EM. LIGHT FL W 5S WHEN MAIN LIGHT IS EXTINGUISHED. HORN: 1 BLAST EV 15S (2S BL).

NA: MOOSE PEAK
DT: ME - FIRST DISTRICT
CT: MACHIAS BAY TO TIBBETT NARROWS
IN: 1390
LL: 44 28 30N 67 31 54W
CH: FL W 30S
HT: 72
RG: 20
DM: ON WHITE TOWER. 57
RM: EM. LIGHT OF REDUCED INTENSITY WHEN MAIN LIGHT IS EXTINGUISHED. HORN: 2 BLASTS EV 30S (2S BL-2S SI-2S BL-24S SI). LOCATED 129 YARDS, 263D FROM LIGHT TOWER.

NA: MORRO BAY W. BREAKWATER
DT: CA - ELEVENTH DISTRICT
CT: ESTERO BAY
IN: 3835 240
LL: 35 21 46N 120 52 11W
CH: FL W 4S
HT: 36
RG: 12
DM: WHITE COLUMN.
RM: OBSCURED FROM 176D TO 207D. HORN: 1 BLAST EV 30S (3S BL). OPERATES CONTINUOUSLY.

NA: MORRO BAY W. BREAKWATER
DT: CA - ELEVENTH DISTRICT
CT: POINT CONCEPTION TO POINT SUR
IN: 240 3835
LL: 35 21 46N 120 52 11W
CH: FL W 4S
HT: 36
RG: 12
DM: WHITE COLUMN.
RM: OBSCURED FROM 176D TO 207D. HORN: 1 BLAST EV 30S (3S BL). OPERATES CONTINUOUSLY.

NA: MOUNT DESERT
DT: ME - FIRST DISTRICT
CT: APPROACHES TO BLUE HILL BAY
IN: 2290 5
LL: 43 58 07N 68 07 42W
CH: FL W 15S
HT: 75
RG: 18
DM:
RM: EM. LIGHT OF REDUCED INTENSITY WHEN MAIN LIGHT IS EXTINGUISHED. HORN: 2 BLASTS EV 30S (2S BL-2S SI-2S BL-24S SI). OPERATES CONTINUOUSLY.

NA: MUKILTEO
DT: WA - THIRTEENTH DISTRICT
CT: PUGET SOUND - NORTHERN PART
IN: 18460
LL: 47 56 55N 122 18 22W
CH: FL W 5S  
HT: 33
RG: 14
DM:
RM: EM. LIGHT: ISO W 6S. HORN: 1 BLAST EV 30S (3S BL).

NA: MUNISING CITY PIER
DT: LAKE SUPERIOR
CT: GRAND MARAIS TO BIG BAY POINT
IN: 14582
LL: 46 24 50N 86 39 07W
CH: FL R 3S
HT:
RG: 14
DM: ON WHITE POST.
RM: PRIVATE AID.