I see that it is possible to get accurate heading. In what situation would that be useful? Are there any other advantages?
Imagine you have a drone: the heading of the drone is not the same as the heading of the travelling direction.
Magnetic compasses are problematic around magnets, metal machines/structures and ore deposits.
A pair of suitably placed antennas can provide orientation and attitude information, even when static.
Applications in agriculture, shipping and vehicles.