Quick Links:
- Distance, Speed, and Time Calculator
- Course and Speed Over Ground (COG/SOG) Calculator
- Tidal Height and Current Calculator
- Latitude/Longitude to Decimal Degrees Converter
- Distance Between Two Latitude/Longitude Points Calculator
- Dead Reckoning Calculator
- Great Circle Route Calculator
- Magnetic Declination Calculator
Welcome to our free collection of marine navigation calculators designed for recreational boaters and maritime enthusiasts. These tools help you plan routes, estimate travel times, and convert coordinates quickly and easily. Whether you’re planning a coastal cruise or an offshore voyage, our calculators provide user-friendly estimates to support your journey.
Please note: These calculators are for informational purposes only. They are not professional tools and should not be relied on for precise navigation or critical decision-making.
Distance, Speed, and Time Calculator
Estimate your travel time based on the distance in nautical miles and your speed in knots. This nautical distance calculator is perfect for planning leisure trips and understanding your vessel’s performance.
Distance, Speed, and Time Calculator
Calculate travel time based on distance (nautical miles) and speed (knots).
Course and Speed Over Ground (COG/SOG) Calculator
Our COG/SOG calculator factors in currents and wind drift to provide an accurate reading of your actual course and speed over ground. Use it to refine your route planning and estimate real-world conditions.
Course and Speed Over Ground (COG/SOG) Calculator
Enter north and east components to calculate your actual speed and course.
Tidal Height and Current Calculator
Plan your coastal journeys by predicting tidal heights and current speeds. This tidal calculator helps you schedule departures and docking times with confidence.
Tidal Height and Current Calculator
Enter tidal range and current speed to get a quick estimation.
Latitude/Longitude to Decimal Degrees Converter
Convert traditional latitude and longitude coordinates to decimal degrees effortlessly. This coordinate converter is essential for digital mapping and GPS use.
Latitude/Longitude to Decimal Degrees Converter
Convert degrees, minutes, and seconds into decimal degrees.
Distance Between Two Latitude/Longitude Points Calculator
Calculate the great-circle distance between two sets of coordinates. This distance calculator helps you determine the shortest route, saving time and fuel.
Distance Between Two Lat/Long Points Calculator
Enter two coordinates to calculate the great-circle distance.
Dead Reckoning Calculator
When electronic navigation isn’t available, our dead reckoning calculator uses speed, course, and elapsed time to provide a backup method for position estimation.
Dead Reckoning Calculator
Enter your speed, course, and time to estimate your new position.
Great Circle Route Calculator
Find the shortest path between two points on the globe with our great circle route calculator. It’s optimized for planning efficient marine voyages.
Great Circle Route Calculator
Enter two coordinates to determine the shortest route.
Magnetic Declination Calculator
Adjust your compass readings by calculating the difference between true north and magnetic north. This magnetic declination calculator is key for fine-tuning your navigation.
Magnetic Declination Calculator
Enter your latitude and longitude to calculate a rough magnetic declination.
Disclaimer: The calculators provided on this page are for informational purposes only. They are not professional tools and should not be used for critical navigation or safety decisions.