Sounds like you found a planet with an anomaly. You get full credit for the SETI signal once you scan a planet that has the signal source but an anomaly is a physical object on the planet surface (not necessarily a SETI planet). You have to use your gauges to pinpoint it. One gauge shows how in front of you it is and the other gauge shows you how on top of it you are. It's best to fly and get roughly in the right area and then land and find it.