Anchor Scope & Holding Calculator
Check required scope and estimate holding confidence for anchoring setup.
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COLREGs Encounter Classifier
Classify head-on, crossing, or overtaking geometry from bearing/course data.
CPA/TCPA Risk Calculator
Compute closest point of approach and time to CPA with risk banding.
Drift Estimator
Estimate set-and-drift impact on course over ground and offset.
ETA Current/Wind Compensation Calculator
Estimate ETA delay from current and wind speed penalties.
Fuel Endurance + Reserve Calculator
Calculate endurance and range after applying reserve fuel policy.
Great Circle vs Rhumb Line Calculator
Compare great-circle and rhumb-line distance, bearing, and ETA.
Tide Window Planner
Estimate passable tidal windows around high tide for draft-limited transits.
Turning Circle / Advance / Transfer Estimator
Estimate turning radius, tactical diameter, advance, and transfer.
Under Keel Clearance Calculator
Assess UKC using depth, tide, squat, wave allowance, and safety margin.