Mini Tools Collection
Useful one-page tools for real work
ToolPatch is a growing collection of focused utilities. Each page handles one task with clear inputs, fast results, and practical outputs.
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Marine & Navigation
Featured
Anchor Scope & Holding Calculator
Check required scope and estimate holding confidence for anchoring setup.
Evaluate anchoring setup with depth, bow height, deployed rode, wind, and bottom type. Useful for anchorage planning to confirm scope requirements and identify higher-risk holding conditions.
Marine & Navigation
Featured
CPA/TCPA Risk Calculator
Compute closest point of approach and time to CPA with risk banding.
Calculate CPA and TCPA from ownship and target kinematics using relative motion vectors. Useful for watchstanding support and collision-risk triage when evaluating multiple contacts.
Marine & Navigation
Featured
ETA Current/Wind Compensation Calculator
Estimate ETA delay from current and wind speed penalties.
Adjust calm-water ETA by combining current component and wind-related speed penalty. Useful for passage updates and operational timing when environmental conditions reduce effective speed.
Marine & Navigation
Featured
Fuel Endurance + Reserve Calculator
Calculate endurance and range after applying reserve fuel policy.
Plan voyage endurance from usable fuel, burn rate, reserve percentage, and cruise speed. Useful for coastal and offshore planning where reserve policy must be explicit before departure.
Marine & Navigation
Featured
Great Circle vs Rhumb Line Calculator
Compare great-circle and rhumb-line distance, bearing, and ETA.
Compute both great-circle and rhumb-line route metrics between two coordinates. Useful for offshore route planning and voyage briefing when deciding between shortest-distance routing and constant-bearing simplicity.
Marine & Navigation
Featured
Under Keel Clearance Calculator
Assess UKC using depth, tide, squat, wave allowance, and safety margin.
Estimate under keel clearance for channels and port approaches by combining charted depth, tide height, vessel draft, squat, and operational margins. Useful for go/no-go checks during shallow-water transits.