Geodetic Calculator

The Geodetic Calculator solves the direct (forward) and inverse (reverse) geodetic problems.

Menu path
→ Tools → Geocalculator

The calculator solves problems on a plane (rhumb line) and on a sphere (great circle).

Hint

It is recommended to use coordinates in the ENC coordinate system — WGS 84 — for calculations.

To calculate

1. Select Task type

2. Select Line type

3. Enter input data (Input data)

4. Press Calculate

№	Element	Description
1	Direct	Select to solve the direct geodetic problem
2	Inverse	Select to solve the inverse geodetic problem
3	Rumb Line	Select to solve the problem on a plane
4	Great Circle	Select to solve the problem on a sphere
5	Origin point coordinates	Coordinates of the origin point from which the problem is solved
6	Direction	Direction from the origin point (for the direct problem)
7	Distance	Distance from the origin point (for the direct problem)
8	Result	Coordinates of the geodetic line endpoint (for the direct problem)
9	Calculate	Press to calculate
10	Point №1 coordinates	Coordinates of the first point (for the inverse problem)
11	Point №2 coordinates	Coordinates of the second point (for the inverse problem)
12	Direction from Point №1 to Point №2	Calculated direction (for the inverse problem)
13	Reverse direction	Calculated reverse direction from Point №2 to Point №1 (for the inverse problem)
14	Distance between points	Calculated distance between Point №1 and Point №2 (for the inverse problem)

Direct geodetic problem

Input data for the Direct geodetic problem: origin point coordinates, direction, and geodetic line length.

Result: endpoint coordinates.

Line types:

• Rhumb line — calculation on a plane

• Great circle — calculation on a sphere

Inverse geodetic problem

Input data for the Inverse geodetic problem: coordinates of the start and end points of the geodetic line.

Result: direction and length of the geodetic line.

Line types:

• Rhumb line — calculation on a plane

• Great circle — calculation on a sphere

Note

After performing the calculation, the input data is not cleared. This allows you to perform a series of calculations with parameter adjustments.

Tip

For precise navigational calculations, it is recommended to use the great circle, as it accounts for the Earth’s sphericity and provides more accurate results for long distances.

Tip

For short-distance calculations (up to 100 nautical miles), the rhumb line can be used, which simplifies calculations and provides sufficient accuracy.