Port winch
- drum circumference = 3.2 m
- twenty wraps of cable = 64 m which is also 2.5" width of cable on the drum
- drum width is ~ 40 " which is 96 wraps or 316 m of cable
Marine Magnetics SeaSpy Magnetometer Operation Manual
Marine Magnetics SeaLINK Software Operation Manual
World Magnetic Model - 2019.0 Main Field Intensity
Magnetometer layback
= 434 m from AFT_GPS. This satisfies the required magnetometer layback of 3 times the length of vessel (3 x 143.4 = 430.2 m)