Which in turn can often be used to determine location and course of bombers trying to skip all base dars on their way to a remote target.
And, another useful technique using town flashing info when your dar is down:
I was defending a base last night which had the radar down, but was able to utilize the flashing of the town (by noticing if it flashed before the base, after the base flashed, or virtually simultaneously) to predict the ingress direction of enemies flying toward the base, allowing me to intercept them more effectively.
<S>
Ryno