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Navigation & Shiphandling
Course to SteerHeading to offset current Rate of TurnROT, radius, or speed Swept PathWidth used when crabbing PI Turn DistanceWhere to set the PI line
Planning
Air DraftClearance under a bridge Anchor SwingSwing radius or shackles Compass CorrectionCompass, magnetic, true Required SpeedSpeed to make a point on time RPMRPM needed for a target speed Slow-Down PointWhen to slow down to arrive on time Speed / Time / DistanceSolve any one — or a full ETA Draft Change (Density)Draft in fresh vs salt water Squat / UKCSinkage at speed & UKC Visible RangeHow far a light can be seen
Weather & Environment
Beaufort ScaleForce & sea state from wind Height of TideHeight between HW and LW True WindTrue wind from apparent Windage & ForceWind push on the vessel (kN)
Stability
Angle of LollWhere negative GM settles Block CoefficientHull fullness (Cb) for squat GM (Roll Period)GM from timing the roll Heel / ListHeel angle & draft increase
Utilities
Unit ConverterDistance, speed, temperature Watch ScheduleTwo-watch rotation plan
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