VOLUME I Multinational Maritime Tactical Instructions and Procedures

MTP 1(D), Vol. I
-EXAMPLES-
(1) Position — 5004N9 15642W8. (The 9 and 8 are the check-sum digits.)
(2) Course — 225T9 degrees true or 225M9 degrees magnetic. (The 9 is the check-sum digit.)
(3) Speed — 15KT6. (The 6 is the check-sum digit.)
(4) Time — 281030Z4. (The 4 is the check-sum digit.)
2110 STANDARD POSITIONS/REFERENCE POINTS/POSITION REPORTING
The standard positions in the force are:
a. QQ — The center of the front of the main body or convoy when not in circular formation.
b. TT — Originator’s present position.
c. XX — The standard position established by the OTC on which a search, enemy reporting and so
forth is to be based.
d. YY — Addressee’s present position.
e. ZZ — The center of the force.
NOTE
Whenever possible, XX should be coincidental with the DLRP.
2111 DATA LINK REFERENCE POINT
a. The data link reference point (DLRP) is the common point from which all positional information
on data link is derived. The DLRP is established by the OTC, in a geographic position, before commencing
link operations, but may be changed for operational and/or security reasons. In principle, the DLRP should
be the same position as the CCG origin, thus ensuring that picture compilation is derived from using the
same origin by TDS and non-TDS units when cooperating.
b. The force track coordinator(s) is (are) responsible for an accurate tactical (data link) picture and
for raid reporting within the force or in a sector, using voice compilation nets. The grid reference unit
(GRU) is responsible to the OTC for maintaining the accurate position of the DLRP and the CCG origin.
The GRU holds by definition the correct position of the DLRP and/or grid origin.
c. Establishing the DLRP. Although more than one DLRP can be established for consecutive
periods and/or for geographic areas, only one DLRP per data link should be effective during a certain
period. The geographic positions of DLRPs and the times of change are to be established well in advance
by the OTC through means of OPORD, OPGEN, etc.
d. Initiating the DLRP. When commencing link operations, all PUs insert the DLRP in their
TDS. On completion, the GRU executes a grid lock.
e. Maintaining the DLRP. The accurate position of the DLRP is maintained by the GRU. When
necessary, the GRU executes a grid lock check to assist in updating PUs.
2-8 CHANGE 1