COMDTINST 3161.2G
28 MAR 1988
5.
DISCUSSION.
a.
Data Collection: Reference (a), which includes the Bathymetric Data Collection Priorities
Chart (5103), details the DMAHTC ocean sounding program and specifies the requirements
and submission format for data. The instructions in reference (a) and on chart 5103 are to
be carefully followed, particularly the development and maintenance of the navigation log
which accompanies the echo sounding record. Soundings are not required in coastal waters
(less than 100 fathoms), lakes or estuaries. Those vessels not equipped with a precision
depth recorder should use the AN/SQN-15.
b.
Classified Operations: Under certain conditions or during sensitive operations, bathymetric
data may require classification. Enclosure (1), OPNAVINST S5513.5A (declassified),
specifies the procedures used in classifying such data. Safeguarding of classified
bathymetric data shall be carried out in accordance with reference (b).
6.
PROCEDURES..
a.
Ocean Sounding Program shall be conducted while underway by Commanding Officers of
WHEC, UAGB (Polar), WMEC, and WLB cutters. Data shall be submitted directly to
DMAHTC in the form specified in reference (a) at the end of each major deployment (two
months or longer) or at frequent intervals (quarterly) if deployments are of short duration.
b.
Annotating the Trace: Sometimes other watch requirements will interfere with annotating
the echogram precisely on the hour and half hour. In such cases the echogram is to be
marked during "lull" periods. It is important that the trace be marked at the beginning of
the minute and that it be annotated at least twice each hour, with at least twenty minutes
between any two annotations.
c.
Preparing the Echosounder for operation, the operator must be sure that the chart paper is
calibrated so that the zero mark is actually zeroed, while taking into account the draft of the
vessel. If this is not feasible, the echogram should be noted as such, and the draft of the
vessel is to be entered at least twice daily on the record. This is especially true in shallow
areas and in areas where hazards to navigation exist.
2
Previous Page
