Figure 6-3.Lifesaving signals (page 4 of 4).
On the 25th of May 1972, an agreement between
the governments of the United States and the Soviet
Union on the prevention of incidents on the high
seas was signed. This agreement was called the
INCSEA agreement. The purpose of this
agreement is to reduce the number of unintended
serious confrontations between the United States
and Soviet Forces on or over the high seas, to
promote safety of operations where the United
States and Soviet Naval and Air Forces operate
in proximity, and to avoid the breaking of
As a part of this agreement, the U.S. and Russian
warships and auxiliary vessels will use the signals
IR 1 I am engaged in oceanographic operations.
2 I am streaming/towing hydrographic survey
3 I am recovering hydrographic survey
4 I am conducting salvage operations.
JH 1 I am attempting to retract a grounded vessel.