If you are going to fly a constant latitude away from the equator you are going to have to get your calculator out and constantly change your heading or shall we say direction if using a gyro.
Ignoring all drift winds effect etc... am I not correct in saying: if you are on a line of Lat (say 50N for example) and head due east then I will remain on that latitude? I.e. following a constant heading will keep me on that Lat?
I've confused myself! Looking at the convergency formula contradicts what I intuitively feel to be correct (i.e. what I stated above).
Convergency = change long x sine(mean Lat) = change of GC track.
Unless that only holds true for great circles in which case my assumption of heading east on a line of Lat (rhumb line) only requires a constant heading...
Help please!