You could try backing the ISP off, and see if there is a difference, but we encounter the same thing in FotRSU. Not an "all the time" kind of thing, but the sonar, especially in the open water areas, will pick-up sometimes way before the radar, given the right circumstances, such as a submerged sub doing Ahead 1/3 (or slower).
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"...and bollocks to the naysayers" - Jimbuna
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