I take 'heading' to mean just that. Maintain the longitudinal axis aligned with that number. That's how the term is defined. Doesn't matter what phrase was used to derive the relevent number - radar instruction, procedure design, runway alignment or whatever.
If TRACK is what is intended then I'd expect that term to be used. Or a functionally equivalent eg 'direction' ie maintain a specific path over the ground.
I certainly DON'T expect instructions to start using an already well defined term to mean some other - and different - well defined term.
Last edited by Tinstaafl; 12th January 2004 at 20:26.