Location problem

<div><p>Hi,<br>&nbsp;&nbsp; I have successfully finished the picking of P and S phase and trying to locate the event but the error message says:<br><br>"single phase station data and no azimuth data available: event not locatable"<br><br>I looked at the S-file and it is updating the record of P and S-phase pick but there are no azimuth values. I looked at the manual and it ask to choose three component waveform for a particular station. It is mentioned that pressing H and then selecting a small window around P will calculate the azimuth and it should be displayed at the bottom of the display page. I followed the instruction but it is not calculating the azimuth. I am also trying to rotate the horizontal component before picking S-phase but back azimuth is not available to complete rotation. I would be extremely grateful if someone can help me with this.<br><br>Thanks<br>Abhash Kumar<br>University of North Carolina<br>United States<br></p></div>