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- Light reflection properties
- Light vessel
- Light vessel station
- Lighted Buoy
- Lighted coastal mark
- Lighthouse
- Lighthouse (PHL)
- Lighthouse service
- Lighthouse tender
- Lighting
- Lighting (of a light)
- Lightning conductor
- Lightning conductor (2)
- Limestone
- Limit state design
- Limited signal
- Line
- Line conductor
- Line voltage (of a three-phase alternator)
- Linear Absorption Coefficient
- Linear detection
- Linear detector
- Linearly polarized wave
- Link
- Link (of a chain)
- Lintel
- Liquid petroleum gas
- Liquidity index
- Load
- Load-bearing stratum
- Load (2)
- Load Regulation
- Load factor
- Lobe
- Local control
- Local generation
- Local oscillator
- Log (of wood)
- Long-Arc Lamp
- Long dash
- Lookout
- Loom
- Loop alignment error
- Loop antenna
- Loop gain
- Loop transfer function
- Lorac
- Loran A
- Loran Base line extension monitor
- Loran C
- Loran C (2)
- Loran C Phase coding
- Loran Cycle match
- Loran Drift control
- Loran Envelope match
- Loran Fixed slave time delay
- Loran Slew control
- Loran Specific repetition rate
- Loran Time base
- Loran chart
- Loran monitor station
- Loran stations
- Loran system
- Loudness
- Loudness level
- Loudness level contour
- Low Pressure Mercury (Vapour) Lamp
- Low Pressure Sodium (Vapour) Lamp
- Lubrication system
- Lumen
- Luminance
- Luminescence
- Luminosity
- Luminous Efficacy
- Luminous Element
- Luminous Exitance
- Luminous Flux
- Luminous Intensity
- Luminous Pencil Beam
- Luminous Range
- Luminous beam
- Luminous fan beam
- Luminous ray
- Luneberg lens
- Lux
- M profile
- M unit
- Machining
- Magnetic Declination
- Magnetic Dip
- Magnetic amplifier
- Magnetic field strength
- Main Electrode
- Main Light
- Main Page
- Main beam
- Main channel
- Main drum (of a winch)
- Main lobe
- Mains supply
- Maintainability
- Maintenance
- Maintenance-free battery
- Making land
- Management
- Manifold (U.S.A.)
- Manipulated variable
- Manned Light (U.S.A.)
- Mantle
- Mantle Burner
- Manual control
- Marginally detectable bias (MDB)
- Marginally detectable error (MDE)
- Marine Aid to Navigation
- Mariner
- Marker beacon
- Marl
- Masonry
- Master oscillator
- Master station
- Matching unit
- Material
- Matrix
- Mattress
- Maximum power(Pmax)
- Mean Daily Low Temperature (MDLT)
- Mean Time To Repair/Restore (MTTR)
- Mean life
- Mean line of course
- Mean power
- Mean power (2)
- Mean sea level
- Mean time between failures
- Mean time between failures (MTBF)
- Mean time to repair
- Mean wind speed
- Measured-Mile Buoy
- Measuring element
- Measuring point
- Mechanical scanning
- Membrane horn
- Memory effect
- Mercury Bath
- Mercury switch
- Mercury switch (2)
- Mercury wetted relay
- Mesopic Vision
- Message
- Message Markers
- Messenger
- Messmotor (G.B.)
- Metacentre (of a buoy)
- Metacentric height
- Metadyne
- Metal Vapour Lamp
- Metal spraying
- Metallised Lamp
- Meteorological Optical Range
- Meteorological Visibility
- Method of bins
- Micrometer Valve
- Mid-Channel Mark (or Buoy)
- Middle-Ground Marks (or Buoys)
- Middle grounds
- Mild steel
- Mill scale
- Mimic diagram
- Miniature Cap
- Miniature Cap/es
- Minimum clearing
- Minimum distance
- Minimum signal
- Mirror
- Mission time
- Mixed Reflection
- Mixed Transmission
- Mixer
- Model course
- Modified refractive index
- Modular construction
- Modulation
- Modulation envelope
- Modulator
- Module
- Modulus of elasticity
- Moisture content
- Mole
- Monitor
- Monkey
- Monochromatic radiation
- Mooring
- Mooring buoy
- Mooring buoy/es
- Mooring eye
- Mooring line
- Mooring recovery wire
- Mooring rope
- Morse Code Fog Signal
- Morse Code Light
- Mortar
- Mortar bed
- Moulded Glass (or plastic)
- Moving target indication
- Multi-Vee Filament (G.B.)
- Multi-cylinder engine
- Multi-point mooring
- Multicore cable
- Multipath propagation
- Murette
- Mushroom anchor (USA)
- Muting
- Nautical mile
- Nautophone
- Navigation
- Navigation (2)
- Navigation Lights
- Navigation Mark
- Navigational Assistance
- Near Miss
- Necessary bandwidth
- Negative feedback
- Neutral Filter
- Neutral axis
- Neutral conductor
- Nickel-cadmium cell
- Nickel-iron cell
- Night effect
- Nigrescence Time (of a lamp)
- Nipple
- No-break power system
- No-load operation
- Node
- Noise
- Noise - electrical
- Noise figure
- Nominal Range
- Nominal operating cell temperature
- Nominal range of a sound signal
- Nominal voltage
- Non-skid covering
- Normal threshold of hearing
- Nut
- ODAS buoy
- ODAS buoy/es
- Observed bearing
- Obstruction Lights
- Occasional Light
- Occultation
- Occulting Hood
- Occulting Light
- Occupied bandwidth
- Octahedral cluster
- Octane number (of petrol)
- Off-centre plan display
- Off-normal (G.B.)
- Off-peak period
- Off-peak power
- Offset
- Oil Lamp
- Oil Lamp/es
- Oil store
- Omega
- Omega Antipodal effects
- Omega Commutation
- Omega Lane resolution
- Omnidirectional antenna
- On-load voltage
- On-off control system
- On-off keying
- On-off switch
- On-the-Job Training (AtoN)
- On-the-Job Training (OJT)
- On-the-job training (OJT)
- Opal Lamp
- Open-circuit voltage
- Open-circuit voltage (Voc)
- Open-link chain
- Open-loop control
- Open-mesh flooring
- Open loop
- Open position (of a switch)
- Operable
- Operating
- Operating air
- Operating conditions
- Optic
- Optic Pedestal
- Optic rotation mechanism
- Optical Axis
- Optical Density
- Optical Focus
- Optical Glass
- Optical Panel
- Optical coupler
- Optimum load impedance
- Order (of an optic)
- Organ of Vision
- Oscillating Boundary
- Oscillating Light
- Oscillating water column
- Outfall Mark (or Buoy)
- Output (process)
- Output channel
- Output data
- Output device
- Output power
- Output state
- Over-interrogation
- Overall efficiency of an R.F. stage
- Overhead (power) line
- Overload
- Overload (2)
- Overload protection
- Overload relay
- Overturning moment
- Oxidation
- Oxygen
- PZ-90 geodetic system
- Pack ice
- Padstone
- Paint
- Paint (2)
- Painting (process)
- Parabolic Reflector
- Parabolic antenna
- Paraffin (soil)
- Paraffin Vapour Lamp
- Parallel-plate lens
- Parallel connection (of sources)
- Parallel redundancy
- Parallelling
- Parapet
- Parasitic radiation
- Parity bit
- Parity check
- Parity code
- Participating Vessel
- Pass
- Pattern
- Pattern recognition
- Peak envelope power
- Peak envelope power (2)
- Peak load
- Peak pulse power (carrier frequency)
- Peak wind speed