Set & Drift • Course to Steer • Course Made Good • SOG • Current Vector • XTE • Multi-Leg Route
Set & Drift Tool Course to Steer, Current Vector & Course Made Good
Solve the current triangle in both directions. Simple mode shows where the vessel will actually go on an entered course through the water, then solves the true course to steer required to make the desired track good. Advanced derives set and drift from observed CTW/STW versus COG/SOG and plans multiple route legs with changing current.
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Need observed-current derivation or a multi-leg route? Click Advanced above.Advanced derives current from observed water and ground vectors, then solves CTS/SOG/ETA independently for each route leg.Fast6 primary inputs
Two answersActual CMG + required CTS
ReferenceAll directions are degrees True
Known Current Route Solution
Current set is the direction the current moves toward.
°T.
knots.
°T, direction of flow toward.
knots.
°T.
nautical miles.
Observed Current Derivation
Current vector = observed ground vector minus the water-referenced vessel vector. CTW is course through water, not necessarily heading where leeway exists.
knots.
knots.
East positive, West negative.
% applied to each route-row drift.
Route Leg Register
| Desired COG °T | STW kn | Set °T | Drift kn | Distance NM |
|---|
Bridge Planning Checks
Navigation limitation: this tool solves steady two-dimensional velocity vectors. It is not a collision-avoidance, pilotage or safe-water decision system. Actual currents change with position, depth and time. Verify current information, charted constraints, traffic, fixes and bridge procedures continuously.