Thanks, Emmett. I solved the surface scan difficulty. The problem began with the manual P30. The wording could be improved (that from a technical writer).
Going back to the probe question. I launched another probe and gave it an order to jump to the next region. The order was displayed in the NID/PLS and the TCO/probe order menu. However, the probe remained outside the CC at zero range and its reflection on the TACSCAN was a fluttering, unstable icon. Any idea what that was about? Also, I couldn't find the VIEW PROBE REGION command on the probe orders menu in the TCO as it is (badly) described on P23 of the manual. Could you be more specific on that?
TIA