| betaks | Calculates Beta and Ks | 
| betam | Calculates Meridional Gradient of the Absolute Vorticity (beta) in mercator coordinates (betam) | 
| coastlines | Coastlines | 
| Ks | Calculates Total Wavenumber for Stationary Rossby Waves (Ks) | 
| Ktotal | Calculates Total Wavenumber for Rossby Waves (K) | 
| ray | Calculates the Rossby waves ray paths | 
| raytracing | raytracing: Rossby Wave Ray Tracing | 
| ray_path | Calculate the ray paths / segment of great circles | 
| ray_source | Calculate the Rossby waves ray paths over a source region | 
| trin | Performs trigonometric interpolation | 
| wave_arrival | Filter the ray paths that arrives in an area of interest | 
| ypos | Interpolation selecting the nearest neighbor |