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 TB 55-1900-232-10
d. Certificate of Seaworthiness
e. Recommendation concerning requirement for riding crew
f. Return of all towing equipment, including towing bridle, if required, to preparing activity/tow originator
g. Designation of the receiving activity.
3-2.3 TOWING COMMAND. The towing Commanding Officer is responsible for the following:
a. Determination of date and time of sailing
b Determination of transit route
c. Determination of towing rig and trim conditions
d Inspection of the tow and acceptance, if deemed either satisfactory or a "Calculated Risk"
e Maintenance and security of tow during transit
f. Delivery of the tow and obtaining a receipt from the receiving activity.
3-2.4 TRANSIT COURSE SELECTION.
a. The first consideration in planning a tow is the predicted weather en route. The Optimum Track Ship Routing (OTSR)
system must be utilized by the towing command. In addition, frequent contact should be made with the Navy Weather
Center. A longer course, on a favorable weather track, should be selected in favor of a shorter one with unfavorable
weather. The transit course should be determined using pilot charts as an aid. It is good practice to note locations along
or near the track where a lee can be found, where practicable, to effect inspection, repair the tow or take shelter in case
of heavy weather.
b The Navigation Officer shall be familiar with the charts of all areas to be transited, including potential safe havens He
shall consider geographic features such as lees of headlands, effects of river outflows and tidal currents. On entering a
safe haven, the Navigator shall be aware of water depths where the tow wire may snag. The Navigator shall stand ready
to recommend shortening the towline as required.
c. It should be clearly understood in advance by all concerned, to within what distance from shore the ocean tug expects
to remain connected--and, conversely, how far out from shore the harbor tugs are prepared to retain charge of the tow.
Both parties should advise of any weather/sea condition limitations on their abilities.
3-2.5 TOWING LOAD REQUIREMENTS. The tow sponsor should arrange for review of records of previous tows of
similar ships or craft and should predict towing resistance, using Chapter 5 and Appendix G if the tow's resistance is not
well-known.
WARNING
Do not overextend the tug's capabilities. If necessary, provide for a tug transfer or a means of replenishing
either from another ship or from the tow itself. Failure to make such arrangements
could seriously jeopardize the mission.
Towing speed should be consistent with safeguarding the tow and tug. It is likewise advisable for the towing ship to
independently calculate the towing resistance, to confirm that its towing equipment is adequate and that its power is
sufficient for the task at the desired speeds.
3-2.6 TOW RIG CONFIGURATION. Plans for a variety of tow rigs can be found in Appendices I and J Selection of the
tow rig is best based on its past performance and the needs of the particular tow Before towing a new or unique
configuration, ensure that the design of the
3-2
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