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I've heard of this before several years ago... All GPS are set up for speed preferences for particular roads and sometimes it gets messed up (or someone messed them up). I've not had this problem but have heard it from others in other forums. Only one time I found that someone had changed their settings and then put them back when they complained and someone mentioned they should check the GPS settings.
I don't recall it was 325 mph, but it was something pretty high. You might try contacting Garmin and putting in a question about what the cause could be.
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