I as yet never used the active sonar, but I think you have to train the hydrophone on a sound source and then send out a ping to get the distance to this ship.
With radar it depends on what kind of radar you have. One sweeps only in front of the boat, so you have to turn the boat for a 360° scan, another one sweeps 360° even whithout moving the boat.
If there is a contact whithin radar range the green line will spike. The two numbered scales left and right represent the range, i.e. if the spike is at 14, it means the contact is at 1400 m from the boat. There is a switch on the right to change the scale.
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