VOLUME I Multinational Maritime Tactical Instructions and Procedures

MTP 1(D), Vol. I
13030 MINE COUNTERMEASURES (MCM)
The aim of mine countermeasures is to permit Allied warships and merchant vessels to use the seas
and enter and leave ports, as necessary, to further the war effort and support the population, without
sustaining unacceptable damage or losses from enemy mines. This aim can be achieved by offensive and
defensive MCM.
a. Offensive MCM is intended to prevent the enemy from successfully laying mines. Included
under this heading are:
(1) Strategic bomb/missile attacks.
(2) Attacks on enemy minelayers.
(3) Laying own offensive/defensive minefields.
b. Defensive MCM is designed to reduce the threat from mines after they have been laid. They include:
(1) Passive countermeasures.
(2) Active countermeasures.
c. NOT RELEASABLE
13031 PASSIVE MINE COUNTERMEASURES
a. Localizing the Threat. The threat can be localized, mine clearing forces concentrated, and
shipping more effectively controlled by the establishment of a system of routing ships when passing
through mineable waters. Movement of shipping by convoy and an adequate navigational warning system
are also desirable.
b. Locating the Minefield. The laying of a minefield may be reported by mine watchers or other
intelligence sources. Knowledge pertaining to a minefield is of maximum importance to maritime
authorities. Units gaining intelligence of minelaying operations are to report it to the appropriate
commanders.
c. Reducing the Risk. Risk may be reduced by:
(1) Altering Navigation Aids. Lighthouses may be extinguished or have their lights dimmed; buoys
may be reduced to the minimum required for safe navigation of Allied shipping. Radio-locating systems
should be operated with caution as it is possible for an enemy minelayer to use them for fixing position.
(2) Self-Protective Measures. See Article 13032.
13-4 ORIGINAL