...
- drum circumference = 3.2 m
- twenty wraps of cable = 64 m which is also 2.58" width of cable on the drum
- drum width is ~ 40 " which is 96 wraps or 316 m of cable
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= 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)
= 508 507 m from moonpool (AI fileMagnetometer_Layback.ai/ image)