Calculate angle between two Latitude/Longitude points

Question

Is there a way to calculate angle between two Latitude/Longitude points?

What I am trying to achieve is to know where the user is heading. For example, user is head

Answer 1

Make sure its a rhumb line bearing NOT a great circle bearing as the initial bearing changes according to distance

 double angle= Math.min((pbearingf-tbearingf) < 0 ? pbearingf-tbearingf+360:pbearingf-tbearingf, (tbearingf-pbearingf)<0?tbearingf-pbearingf+360:tbearingf-pbearingf);