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TermDefinition
- DanbuoyA temporary mark to indicate position or a man overboard. A flag flown from a spar passing through a float weighted at the bottom Read more
- DavitA crane, often working in pairs and usually made of steel, used to lower things over the side of a ship, including launching a lifeboat over the(...) Read more
- Dead ReckoningThe vessel's approximate position derived solely from the compass course steered and distance run according to the log. It makes no allowance(...) Read more
- DRThe vessel's approximate position derived solely from the compass course steered and distance run according to the log. It makes no allowance(...) Read more
- Deck LogA book in which all matters concerning navigation are entered Read more
- Phonetic Alphabet Delta Phonetic alphabet letter D or a type of anchor. A delta refers to a landform created at the mouth of a river where it flows into an ocean, sea,(...) Read more
- Phonetic Alphabet Del Ta Phonetic alphabet letter D or a type of anchor. A delta refers to a landform created at the mouth of a river where it flows into an ocean, sea,(...) Read more
- Depression A depression is an area of low atmospheric pressure characterised by inward-spiraling winds. Depressions are often associated with stormy(...) Read more
- DepthAn electronic depth-finding instrument or the amount of water at a given time Read more
- Deviation The deflection of the needle of a magnetic compass caused by the proximity of ferrous metals, electrical circuits or electronic(...) 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
- Is 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