Reece;
ref the Home & End keys manipulating the sonar direction. You can also use your mouse and simply click on the sonar dial face and the 'needle' will rotate to that position. I find that method very handy for "focussing" my electronic ears. (i.e. sonar officer says "merchant, bearing 025, long range, I click on 025 on the dial and the needle spins to that point and voila I hear the b*****). Try it.
Concur ref the range dial, can be annoying at times.