Judging from the fact he asked that question, I think he may be a total new guy.
F6 to the bombadier postion, look down with keypad 0 (not the row of numbers 0, the righ-hand side keypad's 0), and zoom the view all the way in (Z key to turn zoom on and off, and the bracket keys ] and [ to pan in and out).
The crosshairs are always 100% super acurate.
Hans.