There are currently 131 names in this directory beginning with the letter D.
A traditional machete type of cutting tool with a broad blade, with a wide tip and edge on one side. The butt enclosing the full tang is usually made of wrapped cane or bamboo. Made famous around the world as the weapon of the Chindits who fought behind enemy lines during the Burma campaign of World War II.
Artificial barrier across a river meant to obstruct, direct, or slow down the flow of water, thus creating a reservoir or a lake.
Desert Camouflage Uniform is an arid-environment camouflage uniform that was used by the United States Armed Forces from the mid-1990s to the early 2010s. In terms of pattern and textile cut, it is nearly identical to the Battle Dress Uniform (BDU) uniform, but features a three-color desert camouflage pattern of dark brown, pale green, and beige, as opposed to the beige, pale green, two tones of brown, and black and white rock spots of the previous Desert Battle Dress Uniform (DBDU).
Unit for pain measurement. It has not become very successful, as pain tolerance is very subjective and differs from person to person.
Generic name for traditional sailing vessels with one or more masts with lateen sails typically weighing 300 to 500 tons, with a long, thin hull.
A long thrusting dagger. Historically, it was a personal weapon of officers engaged in naval hand-to-hand combat as well as the personal sidearm of Highlanders and from around 1800, the officers, Pipers, and Drummers of Scottish Highland regiments,and Japanese naval officers.
Singular of data it is a set of reference points to locate places on Earth by translating map positions to their real positions on Earth. Horizontal datums are used for describing a point in terms of latitude and longitude while vertical datums measure elevations or depths.
Intentionally crash land an aircraft on water, generally when fuel there is no fuel or when there is no hope of making it to a safe landing area or when a potentially fatal emergency is going on.
Regarded by Hindus as the root cause of creation, sustenance and annihilation. Principal form of the Mother Goddess, she is pure energy.
A metal ring shaped like the letter D used as a lashing point. A D-ring may be used at the end of a strap, or may be secured to a surface with a metal or fabric strap. It swings freely after it has been secured.
Brand name of the fibre invented by DuPont. Called Polythylene Terephthalate (PET), Dacron is known as Terylene in Britain and some other countries. When used in textiles, the term polyester is used, and PET in packaging.
Knife with a very sharp point and two or more sharp edges. Typically designed or capable of being used as a thrusting or stabbing weapon. The distinctive shape and historic usage of the dagger have made it iconic and symbolic. A dagger in the modern sense is a weapon designed for close-proximity combat or self-defense.
Type of small boat, rigid or inflatable, rowed with oars or paddles or external motor Often used as a secondary boat for larger vessels.
Of Korean origin it is a small cooking and serving vessel for one to two servings of rice. It does not cool off once removed from the stove and the rice continues to cook and arrives at the table.
A device mounted outside a boat and attached to the stern, to slow the boat in a storm and to keep the hull perpendicular to the waves, preventing excessive speeding.
A unit to measure intensity of sound. Standing close to the source, near total silence is 0dB, normal conversation 60dB, jet engine 120dB and gunshot 140dB. Sounds above 85dB can cause hearing loss and sounds above 185dB can rupture ear drums and make the lungs explode leading to death.
Smaller to a rucksack, it is for short trips into the wilderness containing clothes and a survival kit.
Commonly known as double vision, it is the simultaneous perception of two images of a single object that may be displaced horizontally, vertically, diagonally or rotationally.
The removal of sediments and debris from the bottom of lakes, rivers, harbours and water bodies, because of sedimentation.
When forced underwater, respiration is entirely impaired and results in a quick and silent death.
A type of electricity-producing chemical cell, commonly used as batteries - Zinc Carbon or Alkaline. It can be used in any orientation without spilling, as it contains no free liquid, making it suitable for portable equipment.
Worn by divers, boaters, water sports enthusiasts, etc, it provides insulation when immersed in water.
When one loses sense of direction, one gets disoriented. This happens when surrounded by thick trees and foliage in a forest. It can happen underwater when the sense of up or down becomes blurry.
Marine equivalent of a survival kit with essential survival items when the primary vessel sinks. Also known as the Abandon Ship Bag.
Any mesh bag usually used to contain soiled laundry or a zippered container for toiletries.
Traditional woodworking hand tool used to shape wood by removing shavings, comprising a blade attached to handles at each end. The blade is longer than it is deep and it is pulled or drawn to get the job done.
Originally used by the military, it is renowned for its adhesive properties apart from a range of other multipurpose uses it can be put to.
An undesirable and frightening society, with a cataclysmic decline in morals, law, etc. An antonym for utopia.
Dakota Fire Pit
A largely smokeless below-ground firepit, it requires lesser fuel than open flames, is concealed, but requires more energy to construct. It has two underground holes connected at the base - one for fuel, the other for wind. As the fuel burns, hot air rises in the hole while cooler air rushes in from the feeder hole to maintain oxygen levels.
Also called black tourism or grief tourism, it is defined as tourism to places historically associated with death and tragedy.More recently, it was suggested that the concept should also include reasons tourists visit that site, since the site’s attributes alone may not make a visitor a “dark tourist”.
The difference in co-ordinates between datums. It can vary from one place to another within one country or region, and can be anything from zero to hundreds of meters. The North Pole, South Pole and Equator will be in different positions on different datums. Because the Earth is an imperfect ellipsoid, localised datums can give a more accurate representation of the area of coverage than WGS 84. As the benefits of a global system outweigh greater accuracy, WGS 84 datum is becoming increasingly adopted.
Method of calculating current location on a map based on distance travelled, time it took and speed from a known location. With modern gadgetry, it is slowly losing popularity.
A trap for hunting animals where a heavy object is used to crush and kill an animal that activates the trigger. There are many deadfall traps, usually derived from Native American tribes that used them.
Refers to altitudes above a certain point where the amount of oxygen is insufficient to sustain life. This point is generally considered 8,000m.
Results from surfacing too quickly from an underwater dive. Also called ‘bends’, symptoms include skin rash, visual disturbance, balance disturbance, breathing difficulty, unconsciousness and even, death.
Any knot that is pleasing to the eye can be termed a decorative knot. Decorative knots have more of an aesthetic appeal than a functional purpose, though some might have practical uses.
The deep draft of a vessel is the distance from the surface of the water to the deepest part of the hull below the surface. The clearance of the vessel is the distance from the deep draft to the underwater obstacle.
Deep Water Blackout
Loss of consciousness caused by cerebral hypoxia on ascending from a deep freedive or breath-hold dive, typically of ten metres or more. The swimmer does not experience an urgent need to breathe. Victims typically black out close to the surface, usually within the top three metres.
Deep Water Soloing
Form of solo rock climbing practiced on sea cliffs at high tide relying solely on the presence of water at the base of a climb to protect against injury from falling. Also known as Psicobloc.
Coping technique to reduce anxiety from potentially harmful stimuli by distorting, manipulating, repressing or denying reality. They are unconscious and should not be confused with conscious coping strategies.
A cognitive strategy which individuals use to prepare for anxiety-provoking events or performances by setting low expectations and then taking action to either avoid or to prepare for them, thereby harnessing the anxiety that might otherwise be detrimental to their performance.These preventative actions reduce anxiety and promote superior performance.
Common treatment for life-threatening cardiac conditions and consists of delivering a dose of electrical current to the heart with a device called a defibrillator.
Removal of a forest for subsequent use in non-forest purposes like grazing, plantations, habitation, settlements, etc.
Household appliance to reduce humidity in the air. Dehumidifiers extract water from the air and though not ready to drink, can be purified to become potable.
Moisture removed from food for increased shelf life by inhibiting the growth of bacteria, yeasts and mold through the removal of water, and to reduce weight of the food. Food can be dehydrated in many ways - air, heat, wind, smoke and or by using electric dehydrators.
Excessive loss of water from the body results in dehydration, followed by heat stroke and eventually death. Staying hydrated helps maintain core body temperature.
A mosquito-borne tropical disease caused by the dengue virus. Symptoms (high fever, headache, vomiting, muscle and joint pains, skin rash) typically begin three to fourteen days after infection. Recovery generally takes less than two to seven days. In a small proportion of cases, the disease develops into the life-threatening hemorrhagic fever, resulting in bleeding, low levels of blood platelets and blood plasma leakage, or into dengue shock syndrome, where dangerously low blood pressure occurs.
A state of low mood and aversion to activity affecting thoughts, behaviour, feelings and sense of well-being. Depressed people can feel sad, anxious, empty, hopeless, helpless, worthless, guilty, irritable, angry, ashamed or restless. They may lose interest in activities that were once pleasurable, experience loss of appetite or overeating, have problems concentrating, remembering details or making decisions, experience relationship difficulties and may contemplate, attempt or commit suicide. Insomnia, excessive sleeping, fatigue, aches, pains, digestive problems or reduced energy may also be present.
A hypothesis developed by Lauren Alloy and Lyn Yvonne Abramson that depressed individuals make more realistic inferences than do non-depressed individuals. Although depressed individuals are thought to have a negative cognitive bias that results in recurrent, negative automatic thoughts, maladaptive behaviors, and dysfunctional world beliefs,depressive realism argues not only that this negativity may reflect a more accurate appraisal of the world but also that non-depressed individuals’ appraisals are positively biased.
Act of measuring water depth to make maps of the floor of a body of water. Traditionally shown on nautical charts in fathoms and feet. The National Oceanic and Atmospheric Administration (NOAA) still uses fathoms and feet, while other countries metres is used.
Process of removing salt from water to make it drinkable. There are a lot of different ways water can be desalinated. Drinking salt water is never a good idea since it will dehydrate the body further and ultimately result in death.
A steroid medication used to treat a variety of ailments. For mountaineers, it is used in the treatment of high-altitude edemas and is commonly carried on expeditions to help climbers deal with complications of altitude sickness.
Digital Elevation Model
A 3D representation of a terrain’s surface, commonly for a planet, moon, or asteroid created from terrain elevation data.
Digital Selective Calling (DSC)
A standard for sending predefined digital messages via the medium-frequency, high-frequency and very high frequency maritime radio systems and a core part of the Global Maritime Distress Safety System. It uses a stable signal with a narrow bandwidth and the receiver has no squelch and has a slightly longer range than analog signals and is significantly faster. DSC senders are programmed with the ship’s Maritime Mobile Service Identity (MMSI) and may be connected to the ship’s GPS, which allows the apparatus to know who it is, what time it is and where it is.
Removing impurities and contaminants like microorganisms from water is disinfecting. It is short of purifying or sterilising.
The process of removing pathogens from contaminated water to make it potable. The contaminated water is boiled and the escaping steam collected, condensed and reconverted back to water … without any nasties.
A type of weather radar that determines whether atmospheric motion is toward or away from the radar. It determines the intensity of rainfall and uses the Doppler effect to measure the velocity of droplets in the atmosphere.
Commonly known as Diplopia, it is the simultaneous perception of two images of a single object that may be displaced horizontally, vertically, diagonally or rotationally.
A raft capsises after encountering an obstacle. The raft usually flips over downstream or in the direction of travel. A downstream flip may be exacerbated by a heavier load or more people in the raft.
A male bee produced from an unfertilised egg. Unlike female worker bees, drones do not have stingers and do not participate in nectar and pollen gathering. Its primary role is to mate.
Multiple short lines attached to a fishing line to allow multiple catches with one cast.
Separation and collection of solid human waste (to compost and turn into fertiliser) and urine (to irrigate plants because of the high nitrogen content).
A boat made out of a hollowed out tree trunk and is one of the oldest forms of water transportation.
An area where high surface winds have picked up loose dust, reducing visibility to less than half a mile. Loose dirt and sand from a dry surface is blown in the wind and deposited in another place.
A cast-iron cooking pot with a tight fitting lid for outdoor cooking over coals. Often the lid has a slightly concave rim so that the coals can be placed on the lid for a more even and unform internal heat, allowing the pot itself to act as an oven Dynamic Rope: Stretches
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