Notice to Mariners
Nautical Almanac
North up
North up
NMEA2000
NMEA2000
NMEA0183
NMEA0183
Navstar-GPS
Navstar-GPS
Multihull
Multihull
MSI
MSI
Moderate (in shipping forecast)
Moderate (in shipping forecast)
MCA
MCA
Masthead rig
Masthead rig
MARPOL
MARPOL
MARPA
MARPA
MAIB
MAIB
LORAN
LORAN
Lazy sheet
Lazy sheet
Lazy guy
Lazy guy
Lazarette
Lazarette
Knock
Knock
Kevlar
Kevlar
IYRU
IYRU