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
COLREGs Encounter Classifier
Classify head-on, crossing, or overtaking geometry from bearing/course data.
Provide quick encounter classification from own course, target course, and relative bearing. Useful for training and bridge-team scenario review. Output is advisory only and should never replace proper COLREGs application and lookout.
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
Drift Estimator
Estimate set-and-drift impact on course over ground and offset.
Combine vessel heading/speed with current and wind drift vectors to estimate course over ground, speed over ground, and accumulated position offset. Useful for pilotage and small-vessel planning where environmental set can significantly change track over time.
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
Tide Window Planner
Estimate passable tidal windows around high tide for draft-limited transits.
Model a practical tide window from high/low tide heights, charted depth, vessel draft, and safety margin. Useful for bar crossings, marina entries, and shallow-channel planning where timing around high tide matters. The tool estimates available transit duration around high water using a semidiurnal approximation.
Marine & Navigation
Featured
Turning Circle / Advance / Transfer Estimator
Estimate turning radius, tactical diameter, advance, and transfer.
Generate first-pass turning characteristics from speed, rudder angle, and vessel length. Useful for maneuvering briefings and pilot exchange preparation when full sea-trial data is unavailable.
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.