I've noticed the same thing too. You shouldn't know the range until the ping comes back. The best way not to cheat is to volluntarily not press the range button till you hear the return ping.
Another thing I've noticed is that the SO's sonar range is inflated compared with the 0-5000yard range indication.
Plus I thought it'd be cool if the dial kept going round and around so I could count as many yards as I like >.>
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