Detailed Great Circle calculation and Marine Route planning

Great circle sailing

Calculate a complete great circle and use it for practical ocean passage. Initial and final course, Vertex, Rhumb line segments, etmal, meridian intersection, Composite sailing, Loxodromic and orthodromic distance. Create your Great Circle via Great Circle or Meridian Intersection points.



Convert Temperatures, Fahrenheit, Celcius, Kelvin, Rankine


Route planning

Check how many nautical miles it is from your departure to your arrival port.


  • The Significance of Great Circle Routes

    The concept of the Great Circle is crucial in various fields today, especially in the context of global warming and environmental sustainability. Embracing Great Circle routes not only minimizes distances traveled, thus reducing fuel consumption and emissions of carbon dioxide (CO2), but it also plays a pivotal role in decreasing the consumption of harmful refrigerants like hydrofluorocarbons (HFCs) and heavy fuel oil (HFO).

  • Environmental Impact and Benefits

    By prioritizing Great Circle navigation and transportation strategies, we contribute to a more eco-friendly approach, addressing the pressing concerns of climate change and the urgent need to reduce our ecological footprint. This practice not only benefits the environment but also aligns with the global efforts to combat climate change and build a sustainable future.

  • Great Circle Calculation

    Embarking on a practical Great Circle ocean passage offers more than just the shortest distance between two points. It's a strategic approach that not only considers the initial and final course but also leverages rhumb line distances to optimize the route. By sailing along the Great Circle, mariners can significantly save bunker fuel and time. This efficient navigation technique takes advantage of the Earth's curvature, providing a more direct path across the ocean. The result is a cost-effective and time-saving maritime journey, making the most of the vessel's resources while ensuring a swift and economical passage.

  • Great Circle Nowadays

    In the contemporary maritime landscape, Electronic Chart Display and Information Systems (ECDIS) and Global Positioning System (GPS) devices play pivotal roles in navigation, efficiently calculating Great Circle tracks to optimize vessel routes. However, for students and those seeking opportunities in the maritime domain, it is essential to not only rely on automated calculations but also develop a hands-on understanding of the process. Taking the initiative to check and verify the calculations provides valuable insights, ensuring a comprehensive grasp of the Great Circle route displayed on the map. This proactive approach not only enhances navigational skills but also fosters a deeper appreciation for the intricacies of maritime navigation. Additionally, our site offers an opportunity for students to see and track their progress in applying practical Great Circle navigation, creating a dynamic learning environment that combines theoretical knowledge with real-world application.