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TermDefinition
- DepthAn electronic depth-finding instrument or the amount of water at a given time Read more
- Deviation card A deviation card is produced for a steering compass once it has been swung. The card provides the details necessary to correct the compass for(...) Read more
- DiaphoneA powerful two-tone fog signal with a grunt at the end. Read more
- Digital Selective CallingIs the process of sending a digital message using a VHF transmission. It is used to send and listen for distress signals in maritime situations(...) Read more
- Dilution of Precision Dilution of Precision is a term used in satellite navigation and geolocation that refers to the effect of the geometry of the satellite(...) Read more
- DOP Dilution of Precision is a term used in satellite navigation and geolocation that refers to the effect of the geometry of the satellite(...) Read more
- DinghyA type of small boat, often carried or towed as a ship’s boat by a larger vessel. Also small open sailing boats often used for racing and training Read more
- Dip the EnsignTo lower the ensign briefly as a salute. It is not re-hoisted until the vessel saluted has dipped and re-hoisted hers in acknowledgement Read more
- Direction of BuoyageIndicates which side the Port and Starboard marks will be found if you are navigating in a channel Read more
- Directional LightA light illuminating a sector or very narrow angle and intended to mark a direction to be followed. Read more
- DisplacementThe weight of a vessel defined as the weight of water displaced by that vessel Read more
- Displacement VesselA displacement hull moves (pushes apart) the water it passes through. Hence displacing the water. Read more
- Distance Distance refers to the measurement of how far a vessel has travelled from one point to another. Measured in nautical miles, it is an important(...) Read more
- DTW Distance to Waypoint indicates the distance between the vessel and a specific point or location known as a waypoint. The distance is given as(...) Read more
- Distance to Waypoint Distance to Waypoint indicates the distance between the vessel and a specific point or location known as a waypoint. The distance is given as(...) Read more
- Dividers Instrument with two points used to measure distances and assist chart work. Read more
- DodgerScreen fitted to give the crew protection from wind and spray Read more
- DolphinA mooring post or group of piles Read more
- Double UpTo put out extra mooring lines when a storm is expected Read more
- DouseTo lower a sail; To extinguish a light quickly Read more