| betaks | Calculates Beta and Ks |
| coastlines | Coastlines |
| ray | Calculates the Rossby waves ray paths |
| raytracing | raytracing: Rossby Wave Ray Tracing |
| ray_path | Calculate the ray paths / great circles |
| ray_source | Calculate the Rossby waves ray paths over a source region |
| trin | Performs trigonometric interpolation |
| ypos | Interpolation selecting the nearest neighbor |