Contacts in Broadband

[Pishky]

Hi there gurus.

I have a question about contacts in Broadband on the Seawolf SSN.
Assume that I have a contact in the waterfall that looks like this
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As soon as I start to make a turn there is a little wobble in the contact that looks something like this
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I can't for the life of me understand why this is the case. The same wobble can be seen on the false contact as well.
Any ideas??

Thanking in advance

Peter[/img][/u]