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- Classification of emissions (5 categories)
- Identification of an AtoN Light (5 categories)
- Marine Aid to Navigation (5 categories)
- Background Lighting (5 categories)
- Blondel-Rey Law (5 categories)
- Heritage marine aid to navigation (5 categories)
- Winter buoy/es (5 categories)
- Historic Lighthouse (5 categories)
- Background Luminance (5 categories)
- Fluorescence (5 categories)
- Oscillating Boundary (5 categories)
- Surface Colour (5 categories)
- Competence (AtoN) (5 categories)
- Mooring buoy/es (5 categories)
- Accredited AtoN Training Organisation (5 categories)
- Qualification (AtoN) (5 categories)
- Risk (5 categories)
- Fog signal (5 categories)
- Competent Authority (AtoN) (5 categories)
- TestPage/de (5 categories)
- Risk Control (5 categories)
- Geographical Range (5 categories)
- AtoN Personnel (5 categories)
- Allard's Law/de (5 categories)
- Approved AtoN Training Course (5 categories)
- Rival Light (5 categories)
- Vertical Beam Divergence (5 categories)
- Aid to Navigation (5 categories)
- Confirmation of an AtoN Light (5 categories)
- Spectral Luminous Efficiency (5 categories)
- Caution (5 categories)
- Sector Accuracy (5 categories)
- Audible Signal (5 categories)
- Gong Buoy (U.S.A.) (2) (4 categories)
- Automatic Identification System (AIS) (3) (4 categories)
- Chord line (4 categories)
- Necessary bandwidth (4 categories)
- Detection of an AtoN light (4 categories)
- Light Valve (4 categories)
- Codes on Alerts and Indicators (4 categories)
- Feathering (4 categories)
- Octahedral cluster (4 categories)
- A-display (4 categories)
- Diffusion (4 categories)
- Composite Group-Flashing Light (4 categories)
- Fixed antenna direction finder (4 categories)
- Disability Glare (4 categories)
- Focusing Device (4 categories)
- Radio beacon characteristic (4 categories)
- Bullseye (4 categories)
- Angle of Polarization (4 categories)
- Fusion Frequency (4 categories)
- Arc (Discharge) (4 categories)
- Lamp Changer/es (4 categories)
- Reduced carrier (4 categories)
- Celestial horizon (4 categories)
- Vertical beam width (4 categories)
- Systematic errors (4 categories)
- Lighthouse (4 categories)
- Restoration (4 categories)
- Colour (G.B.) (4 categories)
- Bearing correction (4 categories)
- Omega Antipodal effects (4 categories)
- Sound emitter (4 categories)
- Distance finding station (4 categories)
- Wreck (2) (4 categories)
- Ambiguity (4 categories)
- Maintenance-free battery (4 categories)
- Buoy store (4 categories)
- Fresnel Profile (4 categories)
- Assigned frequency (4 categories)
- Electromagnetic waves (4 categories)
- Large navigation(al) buoy (4 categories)
- Refurbishment (4 categories)
- Chart error (4 categories)
- Ground wave suppression (4 categories)
- Port Hand Mark (or Buoy) (4 categories)
- Back lobe (4 categories)
- Equipotential bonding (4 categories)
- Reserve buoyancy (4 categories)
- Hazard (4 categories)
- Failure (4 categories)
- Rhythmic (4 categories)
- Horn (4 categories)
- Threshold of hearing (4 categories)
- Conical Buoy (G.B.) (4 categories)
- Quantizer (4 categories)
- Blocking diode/es (4 categories)
- Alarm (4 categories)
- Disturbance (4 categories)
- Sector Angle (4 categories)
- Effective acoustic centre (4 categories)
- Mercury wetted relay (4 categories)
- Types of service (4 categories)
- Catadioptric (4 categories)
- Gong buoy (4 categories)
- Chromaticity (4 categories)
- Ballast (4 categories)
- Excess attenuation (4 categories)
- Negative feedback (4 categories)
- Sinker (4 categories)
- Coefficient of (Reflex) Luminous Intensity (4 categories)
- Beacon (4 categories)
- Diffusion Factor (4 categories)
- Composite Group-Occulting Light (4 categories)
- Bezold-Briicke Phenomenon (4 categories)
- Loran chart (4 categories)
- Winter buoy (4 categories)
- Racon (4 categories)
- Along-track error (4 categories)
- Correcting range (4 categories)
- Radio beacon range (4 categories)
- Percentage of Visibility (4 categories)
- Angle of Uncertainty (4 categories)
- Cupola (4 categories)
- Isotropic or absolute gain of an antenna (4 categories)
- Can Buoy (4 categories)
- Arc Lamp (4 categories)
- Metallised Lamp (4 categories)
- Lampholder (4 categories)
- Redundancy (4 categories)
- Unlighted Buoy (4 categories)
- Dead time (4 categories)
- Reflector (4 categories)
- VTS Manager (4 categories)
- Character (4 categories)
- Groin (4 categories)
- Leg (of chain) (4 categories)
- Extra High Pressure Mercury (Vapour) Lamp (4 categories)
- Lighthouse (PHL) (4 categories)
- Watchkeeping (4 categories)
- Colour Filter (4 categories)
- Omega Commutation (4 categories)
- Long-Arc Lamp (4 categories)
- Identification signal (4 categories)
- Purkinje Phenomenon (4 categories)
- Order (of an optic) (4 categories)
- Wreck (2)/es (4 categories)
- Folded dipole (4 categories)
- Course (4 categories)
- International Terrestrial Reference Frame (ITRF) (4 categories)
- Buoy vent (4 categories)
- Fresnel region (4 categories)
- Cut-out wind speed (of a wind-power generator) (4 categories)
- Carbon Arc Lamp (4 categories)
- Gaseous Discharge Lamp (4 categories)
- Assigned frequency band (4 categories)
- Electrodynamic emitter - Diaphragm assembly (4 categories)
- Electronic position indicator (4 categories)
- Chayka (4 categories)
- Group-Flashing Light (4 categories)
- Sustainable (4 categories)
- Reserve buoyancy/es (4 categories)
- Coastal Mark (4 categories)
- Preventive maintenance (4 categories)
- Failure rate (4 categories)
- ODAS buoy (4 categories)
- Differential relay (4 categories)
- Rhythmic Light (4 categories)
- Threshold of perception (4 categories)
- Loran C (4 categories)
- Connecting rod (4 categories)
- Quarantine (Ground) Mark (or Buoy) (4 categories)
- Dither (4 categories)
- Sector Light (4 categories)
- Cross-band transponder (4 categories)
- Cable (4 categories)
- Antinode (4 categories)
- Effective height (G.B.) (4 categories)
- Plane of polarization (4 categories)
- Centre of buoyancy (of a buoy) (4 categories)
- Gong buoy (USA) (4 categories)
- Chromaticity Co-ordinates (4 categories)
- Ballast/es (4 categories)
- Coefficient of permeability (4 categories)
- Profile (of a fixed lens) (4 categories)
- Load (4 categories)
- Biconical antenna (4 categories)
- Discharge Lamp (4 categories)
- PZ-90 geodetic system (4 categories)
- Correction (4 categories)
- Radio beacon station (4 categories)
- Buoy (4 categories)
- Perception (4 categories)
- Angle of incidence (4 categories)
- Isotropic radiator (4 categories)
- Meteorological Optical Range (4 categories)
- Redundancy (2) (4 categories)
- Unwatched Light (4 categories)
- Dead time (2) (4 categories)
- Lantern (4 categories)
- Reflector (2) (4 categories)
- Character (of a navigation light) (4 categories)
- Gross errors (4 categories)
- Lens (4 categories)
- Vessel Technical Error (VTE) (4 categories)
- Climbing form (4 categories)
- Precision (4 categories)
- Colour Stimulus (4 categories)
- Omega Lane resolution (4 categories)
- Dipole (4 categories)
- Illuminance (4 categories)
- Blade pitch (4 categories)
- Distance root mean square (dRMS) (4 categories)
- Wreck (2)/fr (4 categories)
- Folded unipole antenna (4 categories)
- Amplidyne (4 categories)
- Down lead (4 categories)
- Course Made Good (4 categories)
- Cut-out wind speed (of a wind-power generator)/es (4 categories)
- Astragals (4 categories)
- Electrodynamic emitter - Diaphragm suspension (4 categories)
- Miniature Cap/es (4 categories)
- Electronic switching device (4 categories)
- Latching relay (4 categories)
- Cheese antenna (4 categories)
- Group-Occulting Light (4 categories)
- Position control system (4 categories)
- Coastal protection (4 categories)
- Hazard (2)/es (4 categories)
- ODAS buoy/es (4 categories)
- Differential system (4 categories)
- Threshold signal (4 categories)
- Rotating Optic (4 categories)
- Conservation (4 categories)
- Quarter wave skirt dipole (4 categories)
- Body (4 categories)
- Over-interrogation (4 categories)
- Alert (4 categories)
- Cross-track error (4 categories)
- Irradiance (4 categories)
- Aperiodic antenna (4 categories)
- Effective height (U.S.A.) (4 categories)
- Cylindrical wave (4 categories)
- Glazing (4 categories)
- Plane polarized wave (4 categories)
- Centre of gravity (of a buoy) (4 categories)
- Automatic direction finder (4 categories)
- Ballast (2) (4 categories)
- Hi-fix (4 categories)
- Profile (of a lens, other than a fixed lens) (4 categories)
- Beam width (4 categories)
- Aberration/de (4 categories)
- Compressed-air diaphragm horn (4 categories)
- Bifurcation (4 categories)
- Discharge Lamp/es (4 categories)
- Loran stations (4 categories)
- Continuous beam (4 categories)
- Radar beacon (4 categories)
- Topmark (4 categories)
- Correction curve (4 categories)
- Buoy (2) (4 categories)
- Angle of internal friction (4 categories)
- Mean Time To Repair/Restore (MTTR) (4 categories)
- True position (4 categories)
- Candela (4 categories)
- Meteorological Visibility (4 categories)
- Land light (4 categories)
- Dead zone (4 categories)
- Lantern (2) (4 categories)
- VTS Operator (VTSO) (4 categories)
- Surface-following discus buoy (4 categories)
- Availability (qualitative) (4 categories)
- Lens Carriage (4 categories)
- Noise - electrical (4 categories)
- Lighthouse tender (4 categories)
- Retro-Reflecting Material (4 categories)
- Colour Temperature (4 categories)
- Beat (4 categories)
- Accident (4 categories)
- Illuminant (4 categories)
- Flasher/es (4 categories)
- Air-mass (4 categories)
- Distant site error (4 categories)
- Wreck Mark (or Buoy) (4 categories)
- Bridle (4 categories)
- Amplitude (4 categories)
- Down time (4 categories)
- Course to Make Good (4 categories)
- Interrogator (4 categories)
- Front Light (4 categories)
- Cut Screen (G.B.) (4 categories)
- Junction Mark (or Buoy) (4 categories)
- Rear Light (4 categories)
- Astragals (2) (4 categories)
- Electrodynamic emitter - Driver (4 categories)
- Augmentation (4 categories)
- Latency (4 categories)
- Light/de (4 categories)
- Visibility (4 categories)
- Coastal refraction (4 categories)
- Hazard (2)/fr (4 categories)
- Primary Light Source (4 categories)
- Observed bearing (4 categories)
- Differentiator (4 categories)
- Threshold value (or alert limit) (4 categories)
- Loran C Phase coding (4 categories)
- Conservation Area (4 categories)
- Fluorescent Lamp (4 categories)
- Diverged Beam (4 categories)
- Luneberg lens (4 categories)
- Buffer (4 categories)
- Island station (4 categories)
- Aperture (4 categories)
- Message Markers (4 categories)
- Glazing bars (4 categories)
- Plane wave (4 categories)
- Gradient (4 categories)
- Sun switch (4 categories)
- Encoder (4 categories)
- Reliability (of a position fix) (4 categories)
- Circle of uncertainty (4 categories)
- Power gain - antenna (4 categories)
- Ballast (3) (4 categories)
- Light float (2)/es (4 categories)
- Resonance (4 categories)
- Progressive wave (4 categories)
- Bearing (4 categories)
- Load (2) (4 categories)
- Bifurcation Mark (or Buoy) (4 categories)
- Optic rotation mechanism (4 categories)
- Discomfort Glare (4 categories)
- Continuous duty (4 categories)
- Inland tender (USA) (4 categories)
- Topmark/es (4 categories)
- Dominant Wavelength (4 categories)
- Main beam (4 categories)
- Corrective action (4 categories)
- Intermediate Light(s) (4 categories)
- Buoy (3) (4 categories)
- Angle of reflection (4 categories)
- Mean life (4 categories)
- Current-voltage characteristic (4 categories)
- Candela per Square Metre (4 categories)
- Daylight Control (4 categories)
- Landfall Light (4 categories)
- Lantern Glazing (G.B.) (2) (4 categories)
- VTS Operator Certificate (4 categories)
- Character recognition (4 categories)
- Ground and Polished Glass (4 categories)
- Availability (quantitative) (4 categories)
- Level 1 training (4 categories)
- Clock coder (G.B.) (4 categories)
- Retro-Reflection (4 categories)
- Column (4 categories)
- Beat frequency oscillator (4 categories)
- Accreditation (4 categories)
- Whistle Buoy (2) (4 categories)
- Illumination Photometer (G.B.) (4 categories)
- Qualification (4 categories)
- Spar Buoy (4 categories)
- Distortion (4 categories)
- Total Subtense (4 categories)
- Bridle (chain) (4 categories)
- Amplitude modulation (AM) (4 categories)
- Interrupted Quick-Flashing Light (4 categories)
- Buoyage and beaconage (4 categories)
- Antenna effect (4 categories)
- Echo box (4 categories)
- Cut screen (4 categories)
- Junction box (4 categories)
- Cardinal system of marking (4 categories)
- Electrodynamic emitter - Moving coil (4 categories)
- Aural critical band (4 categories)
- Lateral deviation (4 categories)
- Chequers (G.B.) (4 categories)
- Position fixing (4 categories)
- Swing - angle (4 categories)
- Visibility meter (4 categories)
- Coastal tender (USA) (4 categories)
- Bell striker - Dwell time (4 categories)
- Actual range of a sound signal (4 categories)
- Loran Cycle match (4 categories)
- Consol (4 categories)
- Fluorescent Mercury Discharge Lamp (4 categories)
- Diversity factor (4 categories)
- Buffer stage (4 categories)
- Frame (of an optic) (4 categories)
- Anchorage Mark (or Buoy) (4 categories)
- Drum Lens (4 categories)
- Masonry (4 categories)
- Crossbar switch (4 categories)
- Isocandela Curve (G.B.) (4 categories)
- Appearance of Light (4 categories)
- Messenger (4 categories)
- Cathodic protection (4 categories)
- Grading (4 categories)
- Reliability (of an observation) (4 categories)
- Synchronous Lights (4 categories)
- Ballast Lamp (4 categories)
- Executive pulse (4 categories)
- Diameter (of a chain) (4 categories)
- Light float (2)/fr (4 categories)
- Resonance (2) (4 categories)
- High Focal Plane Buoy (4 categories)
- Projector (4 categories)
- Binary (4 categories)
- Optical Axis (4 categories)
- Safety hand-hold/es (4 categories)
- Topmark (2) (4 categories)
- Fog detector (4 categories)
- Corrective maintenance (4 categories)
- Intermediate frequency (4 categories)
- Radio leading line (4 categories)
- Buoy lantern (4 categories)
- Period (of a rhythmic light) (4 categories)
- Angle of refraction (4 categories)
- Current (sensitive) relay (4 categories)
- Cannibalization (4 categories)
- Gallery (4 categories)
- Daylight Signal Light (4 categories)
- Landfall Mark (or Buoy) (4 categories)
- Lantern deck (4 categories)
- VTS Operator Course Certificate (4 categories)
- Characteristic (4 categories)
- Level 2 training (4 categories)
- Preservation (4 categories)
- Base line (4 categories)
- Nominal Range (4 categories)
- Dielectric lens (4 categories)
- Retro-Reflector (4 categories)
- Pseudolite (pseudo-satellite) (4 categories)
- Beat oscillator (4 categories)
- Whistle buoy (4 categories)
- Cones (4 categories)
- Blinking (4 categories)
- Oscillating water column (4 categories)
- Converged Beam (4 categories)
- Total System Error (TSE) (4 categories)
- Bright display (4 categories)
- Amplitude of an observed heavenly body (4 categories)
- Coverage (4 categories)
- Buoyant beacon (4 categories)
- Antenna feed (4 categories)
- Echoing area (4 categories)
- Cycle (4 categories)
- Rebuilding (4 categories)
- Cardioid reception (4 categories)
- Atmospheric Refraction (4 categories)
- Electroluminescence (4 categories)
- Aural masking (4 categories)
- Modulator (4 categories)
- Lateral deviation error (4 categories)
- Position line (4 categories)
- Single-Flashing Light (4 categories)
- Occasional Light (4 categories)
- Bell striker - Plunger (4 categories)
- Fix (4 categories)
- Directional gain (4 categories)
- Loran Drift control (4 categories)
- Quick-Flashing Light (4 categories)
- Focal Distance (4 categories)
- Overload (4 categories)
- Spherical Buoy (4 categories)
- All-Round Light (4 categories)
- Diversity reception (4 categories)
- Track (4 categories)
- Isolated Danger Mark (or Buoy) (G.B.) (4 categories)
- Photometer (4 categories)
- Approaches (4 categories)
- Cathodic protection/es (4 categories)
- Global Navigation Satellite System (GNSS) (4 categories)
- Useful Life (of a lamp)/es (4 categories)
- Automatic light vessel (4 categories)
- Mooring eye (4 categories)
- Decision Maker (4 categories)
- Leading Lights (G.B.) (4 categories)
- Circularly polarized wave (4 categories)
- Hack boat (GB) (4 categories)
- Balustrade (4 categories)
- Projector Lamp (G.B.) (4 categories)
- Load factor (4 categories)
- Binary code (4 categories)
- Flame Arc Lamp (4 categories)
- Optical Density (4 categories)
- Alternating Light (4 categories)
- Correlated Colour Temperature (4 categories)
- Intermittent duty (4 categories)
- Buoy lantern/es (4 categories)
- Starboard Hand Mark (or Buoy) (4 categories)
- Angle section (4 categories)
- ELoran (4 categories)
- Mean power (4 categories)
- Jetting (4 categories)
- Articulated beacon (4 categories)
- Electrical distance (4 categories)
- Daylight control (4 categories)
- Decay time (of a pulse) (4 categories)
- Lantern gallery (4 categories)
- VTS Personnel (4 categories)
- Characteristic frequency (4 categories)
- Ground chain (4 categories)
- Pole Beacon (4 categories)
- Vessel Traffic Service (VTS) (4 categories)
- Harmful interference (4 categories)
- T antenna (4 categories)
- Base line extension (4 categories)
- Nominal operating cell temperature (4 categories)
- Dielectric reflector (4 categories)
- Commutated-capacitor tachometer (4 categories)