Geometrics Inc. G-882 Cesium Marine Magnetometer Page
Towing a magnetometer fish from its center of gravity provides a method to
allow the fish to be towed deeper, hence closer to the bottom for a better
detection range. Generally, a CG towed G−882 will tow two to three times
deeper than when nose towed. Adding a depressor wing to the CG tow point
may double the depth again. Geometrics offer both options for the G−882.
The following provide information regarding tow depths that may be expected
and instructions for assembling.
The following graphs provide an approximate indication for tow depths that may
be expected versus the cable length deployed versus the speed of tow. These
graphs are derived from actual tests. However, they DO NOT provide exact
numbers. The actual depth of tow can be affected by water current speed and
turbulence. Also, turns greatly slow the speed of tow increasing the tow depth.
If you know you are towing in an area that may have potential snags upon
which the tow fish may hang, retrieval of tow cable in the turns may be required
to manage the tow fish depth guarding against snagging.
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Depth (ft)
Speed (knots)
G-881 Nose Tow Depth vs Speed on a 175 ft Cable Length
G-882 Nose Tow Depth vs Speed on a 175ft Cable Length
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