How to determine the direction (N/S/W/E) of movement using two GPS coordinates?

Question

satellite navigation

There are two GPS coordinates (lat,lon,timestamp).
a 45.0677975, 41.9269341, 1523639370
b 45.0688700, 41.9279653, 1523639381
How to calculate the heading azimuth (vector, direction) from these data?
The bottom line is this, there is a GPS track with an array of coordinates and a timestamp - it is necessary to determine from it when the source turned (left from the previous direction to another direction).

Answer 1

As an angle between vectors it is considered. a unit vector along the y-axis and a vector formed by two points.

Answer 2

https://en.wikipedia.org/wiki/Azimuth

Answer 3

For example like this:

double res_1 =  /* Направление */  45.132982 - 45.117557, res_2 =  /* Направление */ 41.946420 - 41.946270;

 output = atan2( res_2, res_1 );

Depending on the difference (permutation of reduced and subtracted) points, atan2 will give an azimuth from the specified line, and then you can postpone any side of the light from the resulting azimuth.