### Online rhumb line calculations using the RhumbSolve utility

Rhumb Line calculation:
 Inverse: lat1 lon1 lat2 lon2 → azi12 s12 Direct: lat1 lon1 azi12 s12 → lat2 lon2

Input (ex. «40.6 -73.8 49°01'N 2°33'E» [inverse], «40d38'23"N 073d46'44"W 53d30' 5850e3» [direct]):

 Output format: Decimal degrees Degrees minutes seconds Output precision: 1m 0.00001d 0.1" 100mm 0.01" 10mm 0.001" 1mm 0.0001" 100μm 0.00001" 10μm 0.000001" 1μm 0.0000001" 100nm 0.00000001" 10nm 0.000000001" 1nm 0.0000000001" Equatorial radius: meters Flattening:

Select action:

Rhumb Line (input in black, output in blue):

```    ellipsoid (a f) = 6378137 1/298.257223563 (WGS84)
status          =

lat1 lon1 (°)   =
lat2 lon2 (°)   =
azi12 (°)       =
s12 (m)         =

S12 (m^2)       = ```

RhumbSolve (version 1.47) performs rhumb line calculations for an arbitrary ellipsoid of revolution. The path with a constant heading between two points on the ellipsoid at (lat1, lon1) and (lat2, lon2) is called the rhumb line (or loxodrome); its length is s12 and the rhumb line has a forward azimuth azi12 along its length. NOTE: the rhumb line is not the shortest path between two points; that is the geodesic and it is calculated by GeodSolve.

There are two standard rhumb line problems:

• Direct:   given [lat1 lon1 azi12 s12], find [lat2 lon2];
• Inverse: given [lat1 lon1 lat2 lon2], find [azi12 s12].
Latitudes and longitudes can be given in various formats, for example (these all refer to the position of Timbuktu):
```        16.776 -3.009
16d47' -3d1'
W3°0'34" N16°46'33"
3:0:34W 16:46:33N```
Azimuths are given in degrees clockwise from north. The distance s12 is in meters.