"Got it," Argent responds. I see him clear the satnav map from his screen and call up a new one. It takes me a moment to realize it’s a magnified real-time image of the terrain ahead, presumably picked up by some external vidcam. The image tracks and zooms in and out as the runner tests out the sensitivity of the controls. Then I notice a small cross-hairs reticule in the center of the screen, and I start to say, "Urn, Argent ..."