"Make Your Present Heading A Radar Heading"

[GunkyTom]

"I just don't want the a/c to deviate from its' current 'track' for any reason."

By Lobby
"Locking an A/C on a heading doesn't guarantee it's track will not change."

Ok, if we are being pedantic, I agree with the above but the direction of travel is dictated by the controller not the pilot. The A/C shouldn't turn unexpectedly to pick up a radial or wander off to look at something interesting as they frequently do here. If there is no reason to give a heading and the a/c is pointing roughly where I want it to, then it can continue own nav until I instruct it otherwise. The point is 'continue present heading' and 'Turn L/R heading' etc achieve the same thing, the a/c is under My control .