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- Busbar
- Butane
- Butane/es
- Buttress
- Cable
- Cable (2)
- Cable holder (GB)
- Cable reliever
- Cable terminal box
- Cairn
- Caisson
- Calibration marks
- Calorific value (of a fuel)
- Camshaft
- Can Buoy
- Canal
- Candela
- Candela per Square Metre
- Cannibalization
- Canopy
- Cantilever
- Cap(G.B.)
- Capacitor motor
- Capacity (of a cell or battery)
- Capstan
- Carbon Arc Lamp
- Carbon dioxide
- Carburettor
- Cardinal system of marking
- Cardioid reception
- Carrier (wave)
- Carrier power
- Carrier power (2)
- Cast in-situ piling
- Cast iron
- Catadioptric
- Cathode
- Cathode ray direction finder
- Cathode ray tube display
- Cathodic protection
- Cathodic protection/es
- Cathodic protection (2)
- Catoptric
- Catwalk
- Caution
- Celestial horizon
- Cement
- Centre of buoyancy (of a buoy)
- Centre of gravity (of a buoy)
- Ceramic tile
- Cetane number (for diesel fuel)
- Chain locker
- Chain sling
- Chain stopper
- Channel
- Channel Light
- Chapter Index
- Character
- Character (of a navigation light)
- Character of a light
- Character recognition
- Characteristic
- Characteristic frequency
- Charge
- Charge (2)
- Chart comparison unit
- Chart datum
- Chart error
- Chayka
- Cheese antenna
- Chemically-depolarised cell
- Chequers (G.B.)
- Chimney
- Chipboard
- Chock
- Chopper
- Chopping
- Chord line
- Chromaticity
- Chromaticity Co-ordinates
- Chute
- Circle of uncertainty
- Circuit breaker
- Circularly polarized wave
- Clamp
- Clapotis
- Clapper
- Classification of bearings
- Classification of emissions
- Clay
- Climbing form
- Clock
- Clock coder (G.B.)
- Closed Loop
- Closed loop control system
- Closed position (of a switch)
- Clutch
- Clutter
- Coast
- Coast guard station
- Coastal Mark
- Coastal protection
- Coastal refraction
- Coastal tender (USA)
- Coasting
- Coat (of paint)
- Coating
- Code wheel
- Coder
- Codes on Alerts and Indicators
- Coefficient of (Reflex) Luminous Intensity
- Coefficient of permeability
- Coefficient of thermal expansion
- Cofferdam
- Cohesion
- Coiled-Coil Lamp
- Coincidence factor
- Collapse load
- Collector ring
- Colorimetry
- Colour (G.B.)
- Colour Filter
- Colour Stimulus
- Colour Temperature
- Column
- Command
- Commutated-capacitor tachometer
- Commutator
- Compaction
- Companding
- Comparing element
- Compensated loop direction finder
- Compensation
- Compensation (2)
- Competence
- Competence (AtoN)
- Competent Authority
- Competent Authority (AtoN)
- Complementary Wavelength
- Complex sound
- Compliance matrix
- Composite Group-Flashing Light
- Composite Group-Occulting Light
- Compound-wound machine
- Compressed-air diaphragm horn
- Compressed air
- Compression
- Compression (2)
- Compression ratio
- Compressor unloading system
- Computer
- Computer Programme (G.B.)
- Concrete
- Concrete block
- Concrete mixer
- Conditions of contract
- Conductor
- Cones
- Confidence interval
- Confidence level
- Confidence limits
- Confirmation of an AtoN Light
- Confusion region
- Conical Buoy (G.B.)
- Connecting rod
- Conservation
- Conservation Area
- Consol
- Consolidation
- Conspicuity
- Constant-current transformer
- Constant-failure-rate period
- Contactor
- Contacts (of a switch)
- Continuity
- Continuous-wave radar
- Continuous beam
- Continuous duty
- Contract documents
- Contrast
- Contrast Threshold
- Control
- Control accuracy
- Control action
- Control cubicle
- Control desk
- Control gear
- Control panel
- Control range
- Converged Beam
- Conversion
- Conversion of electric energy
- Converter
- Cophasing
- Coping
- Copper
- Corbel
- Core (of a cable)
- Core drilling
- Core sample
- Cork
- Cork board
- Corner antenna
- Corner reflector
- Cornice
- Corrected bearing
- Correcting range
- Correction
- Correction curve
- Corrective action
- Corrective maintenance
- Correlated Colour Temperature
- Corrosion
- Corrugated sheet
- Cost estimate
- Counter
- Counterpoise
- Course
- Course Made Good
- Course to Make Good
- Cover (of reinforcement)
- Coverage
- Craft autonomous integrity monitoring (CAIM)
- Crane
- Crank
- Crankcase
- Crankshaft
- Creep
- Cross-band transponder
- Cross-track error
- Cross modulation
- Crossbar switch
- Crossbeam
- Crosstalk
- Cruciform Filament
- Crushing test
- Crystal-oscillator drive
- Cube test
- Cupola
- Curing
- Current
- Current-voltage characteristic
- Current (sensitive) relay
- Curtain wall
- Curve of Luminous Intensity Distribution
- Cut-in wind speed (of a wind-power genearator)/es
- Cut-in wind speed (of a wind-power generator)
- Cut-off screen
- Cut-off wall
- Cut-out wind speed (of a wind-power generator)
- Cut-out wind speed (of a wind-power generator)/es
- Cut Screen (G.B.)
- Cut screen
- Cycle
- Cycle (2)
- Cycle life
- Cylinder (of a reciprocating engine)
- Cylinder block
- Cylinder head
- Cylinder liner
- Cylindrical Filament
- Cylindrical wave
- D.C. tachometer
- Damp-proof course
- Damp-proof membrane
- Damping
- Dan buoy
- Danger
- Dashpot
- Data
- Data processing
- Data reduction
- Davit
- Daylight Control
- Daylight Signal Light
- Daylight control
- Daymark
- Daytime Character
- Daytime Light
- De-emphasis
- Dead load
- Dead time
- Dead time (2)
- Dead zone
- Debug
- Debugging
- Decay time (of a pulse)
- Decca Bowl
- Decca Comparison frequency
- Decca Drift
- Decca Fundamental frequency
- Decca Lambda
- Decca Lane fraction pointer
- Decca Lane identification
- Decca Lane identification meter
- Decca Lane pointer
- Decca Lane slip
- Decca Line
- Decca Locking constant
- Decca Navigator
- Decca Night errors
- Decca Referencing
- Decca Sector pointer
- Decca Variable errors
- Decca Vernier pointer
- Decca Zone
- Decca navigator system
- Decision Maker
- Deck crane
- Decoder
- Decometer
- Deflection
- Deflection curve
- Deformation
- Demodulation - AM
- Demodulation - FM
- Depolished Glass
- Depot
- Depot motor launch
- Depth of discharge
- Derating
- Derivative action
- Derrick
- Derrick (2)
- Derrick hoist
- Design
- Design load
- Design wave
- Designation
- Designation of emissions
- Detecting element
- Detection
- Detection (2)
- Detection of an AtoN light
- Detector
- Detector (U.S.A.)
- Deviation
- Deviation ratio
- Diameter (of a chain)
- Diamond pane
- Diaphone
- Diaphone - Cylinder
- Diaphone - Driver
- Diaphone - Piston
- Diaphragm