I think what you are looking for is under the CONTROLS > MISC tab > F2 EFFECTS drop down box on the upper right side... You can set it to NONE, FLOATING or SHAKING....
Generally, when you are moving closer to you or further away (up and down) the height(s) of the radar scan range changes. It does this because it is a cone. Closer to you the smaller the cones area, further away the larger. The diameter increases as you go further out. But say you want to scan a specific distance at a specific altitude. You may not want to scan a huge amount of sky when you want information about a specific area you know something is up but you aren't seeing them on the screen.
Oozler's post in F2 camera sway . . . was marked as the answer