sentences:  The radar switch-on distance could be set to lower or higher values, the former requiring a more precisely-known target location but reducing the risk to be defeated by enemy Electronic Counter Measures (ECM).An alternative launch mode was called Bearing-Only Launch (BOL).In this mode, the missile was launched in the general direction of the target, and its radar activated from the beginning to scan for the target in a +/- 45° sector in front of the flight path.