VOLUME I Multinational Maritime Tactical Instructions and Procedures

data link reference point (DLRP). A geographic reference position representing the origin of a
Cartesian coordinate system in which track positions are reported within a force.
datum. The last known position of a submarine or suspected submarine after contact has been lost.
datum designator. The alphanumeric or four-figure octal group assigned to a datum for identification
purposes.
datum error. An estimate of the degree of accuracy in the reported position of datum.
datum time. The time when contact with a submarine or suspected submarine was lost.
deception. Those measures designed to mislead the enemy by manipulation, distortion, or falsification
of evidence to induce him to react in a manner prejudicial to his interests.
deck alert. An aircraft alert state expressing the time in minutes required for a specified number and
type of aircraft to become airborne after the order to launch has been given.
defense in depth. The stationing of mutually supporting units or formations designed to absorb and
progressively weaken an attack, prevent initial observations of the whole formation or disposition
by the enemy, and allow the OTC to maneuver to oppose the threat.
degree of readiness. The amount of operational capability of a unit which is currently available.
delegation of authority. An action by which a commander assigns to a subordinate commander a
clearly stated part of his authority.
deliberate attack. In ASW, an attack delivered with maximum accuracy against an enemy submarine
when the tactical situation allows time to obtain accurate attack data.
delivering ship. In replenishment at sea, the ship that delivers the rig(s).
departure point (aircraft). A navigational check point used by aircraft as a marker for setting course.
depressed towed array system (DTAS). A towed-array system which is taken to desired depth
by a towed body or depressor.
detaching. The forming temporarily of a unit from the units of a force for a specific purpose, or the
separation of a unit from the main body for duty elsewhere.
detection. The discovery of the presence of a contact or contact-related data.
direction. The process of planning, decision making, establishing priorities, formulating policies, and
imposing decisions.
direct support. The support provided by a unit or formation not attached or under the tactical command
of the supported unit or formation, but required to give priority to the support operations
required by that unit or formation. A direct support unit operates under the tactical control
(TACON) of a supported force commander. Operational control and tactical command remain
with the assigning authority.
disarmed mine. A previously armed mine which has been returned to a safe state.
dispersion. The spreading of units of a force to reduce vulnerability to enemy action.
MTP 1(D), Vol. I
Glossary-7 CHANGE 1