UWSim: Simulating RADAR using Multibeam Sensor

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I would like to simulate a radar sensor in UWSim environment. I know that it is somehow possible using the multibeam sensor facility, but I would like to get some more ideas about how this could be achieved. Basically I want to get the distances of obstacles from the boat, and I want to do this with a radar mentality. Send rays and get the distances.

<multibeamSensor>
      <name>multibeam</name>
      <relativeTo>part0</relativeTo>
      <position>
        <x> -1.5 </x>
        <y> 0 </y>
        <z> 0 </z>
      </position>  
      <orientation>
        <r>0</r>
        <p>1.57</p>
        <y>0 </y>
      </orientation>
      <initAngle>-60</initAngle>
      <finalAngle>60</finalAngle>
      <angleIncr>0.1</angleIncr>
      <range>50</range>
</multibeamSensor>

How should I use the multibeam sensor facility in order to achieve this? Is there a way to visualize the rays, so that I can verify that I am not doing something odd?

Thanks in advance.