"That depends on the ground presence. Any more than five when intel's dicey and you wanna back off. Singularities have a nasty habit of being quite obnoxious, both in visual and audial terms. They don't often go unnoticed." 

[ disapprovingly ] "Are you really going to carry that bulky hunk of metal for the next six hours? WITHOUT whining about the weight?"

[ quietly, focused ] "Two targets... one o'clock. Three metres left of the Serrice Council sign, you got him?"