VOLUME I Multinational Maritime Tactical Instructions and Procedures

MTP 1(D), Vol. I
f. Changing the DLRP. Changing the DLRP causes disruption of the tactical picture for a short
period and should therefore only be executed when the tactical situation permits. On completion of
changing the DLRP and when all PUs have entered the DLRP in their TDS, the GRU executes a grid lock.
Non-TDS fitted ships are to shift the CCG accordingly.
2112 HELICOPTER REFERENCE POINT
In order to facilitate position reports from and to helicopters, an HRP may be established. Several
types of helicopters are equipped with tactical navigation systems optimized for passing positional
information as a bearing and range from a reference point. The HRP can also be used for updating the
helicopter’s navigation system. With the use of an HRP, position reports can be passed in the clear,
enabling ships and helicopters to process information quickly.
a. Establishing the HRP. The HRP is a geographically fixed position issued by either the Air
Coordinator (AC) in an OPTASK AIR or by the helicopter control unit (HCU) prior to a mission. Due to
navigation system design, the HRP should be as close to possible to the area in which the helicopter will
operate. Preferably targets or contacts to be reported should not be outside 50 nm of the HRP. When an
operation requires more than one HRP, subsequent points can be established and designated with a suffix
(e.g., HRP ALFA, HRP BRAVO) or a code word. For transits, more than one HRP can be established by
the AC or HCU for a limited period of time.
b. Position Reports To and From Helicopters. The HRP can be used to pass geographic
position information, such as an air plan search origin (“DATUM 315 HRP 5 DECIMAL 5”), or as the
common reference when using method B2 in accordance with Table 8-2. When the helicopter initiates a
“Request update,” navigation updates may be passed using the “Standby, mark” procedure.
2113 NOT RELEASABLE
2-9 ORIGINAL