Regarding missing the target on certain pings.
What version are you running?
This could be normal sonar behavior under the circumstances or...
It sounds similar to the transient sonar bug that was reported for passive sonars, and the same cause would active sonar pings to "miss" the target sometimes.
I believe this is being actively looked at for 1.03 Full.
In terms of the FFG sonar, I'm not sure about that, but it may be the way the sonar interface is coded and data is fed into and out of the NavalSimEngine. As long as the contact can hear the first ping, its not really a cheat, but it is a bug, although probably one that would be tough to get at, and not change gameplay all that much, if a player didn't elicit the condition.
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LW

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