COMDTINST 3142.1
The National Weather Service uses oceanographic temperature data for their Gulf Stream
analysis program. These programs rely on real time XBT data as well as detailed analysis of
the original data and logs. On occasion Headquarters, area or district commanders may
authorize special XBT surveys. In such cases the requesting authority will be responsible for
purchasing XBT probes or reimbursing the cutter for XBT probes used for the special project.
5.
OBSERVATIONS. Subject to availability of probes all XBT equipped Coast Guard cutters
shall make bathythermograph observations every six hours while underway in water depths
exceeding 100 fathoms, and may occasionally be directed to make observations in water
depths less than 100 fathoms for special projects. Observations to the maximum depth
obtainable shall be made four times daily at 0000, 0600, 1200, and 1800Z using the T-4 (450
meter) XBT probe. Modification to the routine schedule of observations may be necessary
from time to time. Deviation from the schedule can be authorized by Commanding Officer,
Fleet Numerical Oceanography Center. Deviations shall be reported to Commandant (G-NIO)
and Commander International Ice Patrol. Should operational commitments of higher priority
conflict with required XBT observations, casts should be taken as close as possible to the
scheduled times.
6.
REPORTS:
a.
Bathythermograph observations shall be encoded for radio transmission in the JJXX
format indicated on the Bathythermograph Log Sheet (NOAA Form 77-22). This format
is required for efficient automated processing and analysis, and all older formats are
obsolete and shall not be used. The log sheet pad contains detailed instructions and coding
information.
b.
XBT data shall be transmitted by PRIORITY precedence to the appropriate AIG (for both
unclassified and classified messages):
(1) AIG 7608: For BATHY observations in the NORTH PACIFIC, SOUTH PACIFIC
and INDIAN OCEANS and their associated seas and basins; all areas SOUTH of 60
2