Triangulation example...

[SkybuckFlying]

A second usefull piece of code would be a triangulation example.

Two points on a sphere, plus two bearings/headings.

The intersection of these imaginary lines/arcs would indicate where the "perceived" object would be. a third point... / intersection point.

[cffk]

This is what I call the intersection problem. It is addressed in

Karney, Algorithms for geodesics, Section 8
https://doi.org/10.1007/s00190-012-0578-z

Baselga & Martinez-Llario, Intersection and point-to-line ..., Section 2
https://doi.org/10.1007/s11200-017-1020-z

I plan to address this problem in more detail in a future publication.
ETA = 12 months.

[cffk]

This problem is addressed in my recent paper Geodesic intersections. GeographicLib version 2.3 implements these methods (in C++).