Anchor Scope & Holding Calculator
Check required scope and estimate holding confidence for anchoring setup.
Enhanced Category
Marine & Navigation Tools
Marine navigation tools for passage planning checks around distance, bearing, tides, fuel endurance, current, wind, clearance, and encounter risk.
Start with these tools
Use this collection as planning support alongside official charts, tide/current sources, weather, vessel data, local notices, and bridge procedures.
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.
Common workflow
- Start with route distance, vessel speed, timing, and position assumptions.
- Check tide windows, under-keel clearance, fuel reserve, and environmental effects.
- Use encounter tools when traffic, crossing, or closest-point risk matters.
- Verify every consequential result against charts, instruments, rules, and current local information.
Related collections
Full Marine & Navigation tool list
Anchor Scope & Holding Calculator
Check required scope and estimate holding confidence for anchoring setup.
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.
FAQ
Can these tools be used for live navigation?
They are planning aids only. Live navigation requires official charts, instruments, watchkeeping, weather, tide/current data, local rules, and bridge judgment.
Why combine tide, fuel, route, and encounter tools?
A passage can fail on any one of those constraints. Checking them together gives a more realistic plan than distance alone.
What should I verify outside ToolPatch?
Verify chart datum, tide/current predictions, weather, vessel performance, safety margins, local notices, and regulatory requirements.
How many tools are in this collection?
This category currently includes 10 focused tools, with the most practical starting points shown first.