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- Fresnel Lens
- Fresnel Profile
- Fresnel region
- Friction pile
- Front Light
- Frosted Lamp
- Fuel (2)
- Fuel cell
- Fuel consumption
- Fuel system
- Full-load operation
- Full Operational Capability (FOC)
- Full Radiator
- Full carrier
- Fundamental frequency
- Furling
- Furniture (architectural)
- Fuse
- Fuse Valve
- Fuse carrier
- Fuse link
- Fusible plug
- Fusion Frequency
- Gabion
- Gain function
- Gain of an antenna
- Gain referred to a short vertical antenna
- Gallery
- Gantry crane
- Gap coding
- Gas-Filled Lamp
- Gas Jet
- Gas cylinder
- Gas engine
- Gaseous Discharge Lamp
- Gate
- Gear box
- Gel coat
- Generation of electric energy
- Generator set
- Geographical Range
- Geographical Range (Superseded)
- Geological survey
- Glare
- Glass-reinforced plastic
- Glass wool
- Glazing
- Glazing bars
- Global Maritime Distress and Safety System (GMDSS)
- Global Navigation Satellite System (GNSS)
- Gneiss
- Go-no-go testing
- Goliath Cap (G.B.)
- Gong
- Gong Buoy (U.S.A.) (2)
- Gong buoy
- Gong buoy (USA)
- Grab dredger
- Gradient
- Grading
- Granite
- Grapnel
- Grass
- Gray code
- Grid Filament
- Grit
- Groin
- Gross errors
- Ground-plane antenna
- Ground and Polished Glass
- Ground beam
- Ground chain
- Ground clutter
- Ground swell
- Ground wave
- Ground wave - Radar
- Ground wave suppression
- Group-Flashing Light
- Group-Occulting Light
- Group of wood or steel poles
- Grout
- Grout curtain
- Groyne
- Guard-rail
- Guide blades
- Gunmetal
- Gusset plate
- Gust of wind
- Gutter
- Gutter (of a roof)
- Guy
- HSFG bolt
- Hack boat (GB)
- Half-duplex (circuit)
- Half wave dipole
- Halide Lamp
- Hammer
- Handling capacity
- Handrail
- Handy-billy tackle
- Hardener
- Hardening (of concrete)
- Hardware
- Harmful interference
- Harmonic radiation
- Hatch
- Hawsepipe (of a vessel)
- Hawser
- Hazard
- Hazard (2)
- Hazard (2)/es
- Hazard (2)/fr
- Hazard warning signal
- Hazardous Cargoes
- Head
- Heading
- Height of a Light
- Helical antenna
- Helideck
- Helipad
- Heritage marine aid to navigation
- Hi-fix
- High-speed launch
- High Focal Plane Buoy
- High Intensity Carbon Arc Lamp
- High Pressure Arc Discharge Lamp
- High Pressure Mercury (Vapour) Lamp
- High Pressure Sodium (Vapour) Lamp
- High tensile steel
- Hinge
- Hinged
- Historic Lighthouse
- Hogging moment
- Hoghorn
- Hollow flooring block
- Hollow truncated cone filament
- Homing
- Hook
- Horizontal beam width
- Horizontally polarized wave
- Horn
- Horn - Antenna
- Hot-dip galvanising
- Hour meter
- How to...
- Hub (of a wind-power generator)
- Hub height (of a rotor)
- Hue
- Hunting
- Hunting (of an electric machine)
- Hybrid transformer
- Hydrocarbon
- Hydrogen
- Hydrometer
- Hyperstatic
- Hysteresis
- Ice floe
- Ice ridge
- Ice thrust
- Ideal value
- Idealized system
- Identification of an AtoN Light
- Identification signal
- Illuminance
- Illuminant
- Illumination Photometer (G.B.)
- Image
- Image frequency
- In-situ concrete
- Incandescence
- Incandescence Time (of a lamp)
- Incandescent (Electric) Lamp
- Indirectly controlled variable
- Induction coil
- Induction field
- Induction motor
- Infant-mortality period
- Information
- Information theory
- Inherent regulation
- Inhibit
- Initial Operational Capability (IOC)
- Initialize
- Injection
- Injector pump
- Injectors
- Inland tender (USA)
- Inlet chamber
- Input (process)
- Input channel
- Input data
- Input device
- Input state
- Input variable
- Inspection cover
- Installation error
- Installed capacity
- Instantaneous" automatic gain control
- Instantaneous frequency
- Instantaneous sound power per unit area
- Instantaneous value
- Instantaneous value (2)
- Instruction
- Instruction(s) (as to a vessel’s navigation or movements)
- Instrumental error
- Insulated cable
- Insulating material
- Insulation (of a cable)
- Insulator
- Integral action
- Integrated navigation system
- Integrating Photometer
- Integrity
- Intensity modulation
- Inter-trace display
- Interference
- Interim approval
- Interlocking equisignal system
- Intermediate Light(s)
- Intermediate frequency
- Intermittent duty
- Intermodulation products
- Internal Absorptance
- Internal Procedures
- Internal Transmittance
- Internal combustion engine
- International Terrestrial Reference Frame (ITRF)
- Interrogating signal
- Interrogator
- Interrupted Quick-Flashing Light
- Intervention
- Inverse Square Law
- Inverter
- Ionosphere
- Ionospheric path error
- Ionospheric wave
- Ipot
- Iron
- Irradiance
- Island station
- Isocandela Curve (G.B.)
- Isolated Danger Mark (or Buoy) (G.B.)
- Isolated danger
- Isolated neutral system
- Isolating transformer
- Isophase Light
- Isostatic
- Isotropic or absolute gain of an antenna
- Isotropic radiator
- Jack
- Jack-up platform
- Jamb
- Jetting
- Jetty
- Jib
- Jib (2)
- Jitter
- Joint (of concrete)
- Joist
- Junction
- Junction Mark (or Buoy)
- Junction box
- Kenter shackle
- Kentledge
- Kerb
- KeySender
- Key click
- Keyer (U.S.A.)
- Keying
- Keying relay
- Kink
- Knocking (in a petrol engine)
- L antenna
- Ladder cage
- Ladder hoop
- Lag
- Lamp
- Lamp Changer
- Lamp Changer/es
- Lampholder
- Land drain
- Land light
- Landfall Light
- Landfall Mark (or Buoy)
- Landing
- Landing (of a stairway)
- Landing stage
- Landing stage (2)
- Landmark
- Lane
- Lane count
- Lantern
- Lantern (2)
- Lantern Glazing (G.B.) (2)
- Lantern deck
- Lantern gallery
- Lantern glazing (GB)
- Lantern handhold
- Lantern tower
- Lap (of reinforcement)
- Large navigation(al) buoy
- Lashing
- Latching relay
- Latency
- Lateral deviation
- Lateral deviation error
- Lateral system of marking
- Lathing
- Lattice
- Lattice (2)
- Lead
- Lead-acid cell
- Lead-in
- Lead-in Wire
- Lead-sheathed cable
- Leaders
- Leading Lights (G.B.)
- Leading Marks (G.B.)
- Leading edge
- Leading line
- Leakage power
- Leakproof cell
- Leg (of chain)
- Lens
- Lens Carriage
- Level 1 training
- Level 2 training
- Lewis (GB)
- Life (of a lamp)
- Life Test
- Lift (of concrete)
- Lifting eye
- Lifting gear
- Light
- Light-Centre-Length
- Light/de
- Light (2)
- Light (3)
- Light (4)
- Light Checking device
- Light Exposure
- Light Stimulus
- Light Valve
- Light controller
- Light float