VOLUME I Multinational Maritime Tactical Instructions and Procedures

GLOSSARY
MTP 1(D), Vol. I
Definitions or portions thereof that appear in AAP 6 are indicated by italics.
A
abeam replenishment. The transfer at sea of personnel and/or supplies by rigs between two or more
ships proceeding side by side.
acknowledgment. A message from the addressee informing the originator that his communication
has been received and understood.
acoustic countermeasures (ACM). That division of AW involving actions taken to prevent or reduce
an enemy’s effective use of the underwater acoustic spectrum. ACM involve intentional
underwater acoustic emissions for deception or jamming.
acoustic protective measures (APM). That division of AW involving actions taken to ensure
friendly effective use of the underwater acoustic spectrum, despite the enemy’s use of
acoustic energy. APM involve anti-AWSM and anti-ACM, and may not involve underwater
acoustic emissions.
acoustic warfare (AW). Military action to use the underwater acoustic spectrum to the advantage
of friendly forces by exploiting enemy emissions and controlling friendly emissions.
acoustic warfare support measures (AWSM). That division of AW involving actions to search
for, intercept, and identify radiated underwater acoustic energy for the purpose of exploiting
such radiations. The use of AWSM involves no intentional underwater acoustic emissions and is
generally not detectable by the enemy.
action. The employment of one or more weapon systems to counter a threat.
active EPM. Detectable measures, such as altering transmitter parameters as necessary, to ensure
effective friendly use of the electromagnetic spectrum.
active mine countermeasures. Countermeasures directed toward the destruction of mines after
they have been laid — including minesweeping, mine hunting, and explosive ordnance disposal
(EOD) operations.
advance. The distance gained by a ship in the direction of the original course while turning.
airborne alert. A state of aircraft readiness wherein combat-equipped aircraft are airborne and
ready for immediate reaction.
airborne early warning (AEW). Air surveillance provided by AEW aircraft equipped with search
and height-finding radar and communications equipment.
air controller. An individual especially trained for and assigned the duty of the control (by use of radio,
radar, and other means) of such aircraft as may be allotted to him for operation within his area.
air corridor. Restricted air routes of travel specified for use by friendly aircraft and established for
the purpose of preventing friendly aircraft from being fired on by friendly forces.
Glossary-1 CHANGE 1