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4205 SIDE SCAN SYSTEM 0021769_REV_D
5.3 Towfish Deployment
The 4205-SP Towfish can be towed at speeds of up to 4.8 knots while still meeting NOAA and IHO-44S
specifications of 3 pings on a 1-meter cubed target at 100 meters range. The 4205-MP Towfish can be
towed at speeds of up to 9.6 knots with the same results when operating in HSM.
CAUTION! The deployment instructions below are only meant as a
general guide. Due to varying conditions, exact deployment methods will
change, and it is up to the end-user to modify their deployment
procedure to match the conditions they are working under.
CAUTION! When lowering the towfish in an area where the bottom
topography is unknown, take care not to strike the bottom or a
submerged object. Otherwise, damage to the towfish may occur. Also,
carefully monitor Towfish altitude always during the survey. Failure to do
so may result in the Towfish hitting bottom or becoming snagged.
CAUTION! Do not tow the towfish too close to the survey vessel. Towing
in this manner can cause the towfish to be pulled in against the hull of
the ship due to the low pressure of the propeller wash and the effect of
the water flowing by the hull. Also, sonar reflections from the hull may
be evident in the records.
CAUTION! Do not tow the towfish with the nose angled up or down.
Doing so can degrade the sonar imagery. Verify that the Towfish is as level
as possible when towing it.
NOTE: For detailed towing characteristics for many tow cable types and
lengths, along with Towfish speeds, with or without a depressor, refer to
“Towing Characteristics for EdgeTech’s 4205 Towfish,” Revision 11.
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