Raymarine Alarm US???????

[Marc14857]

Does anyone understand the periodic alarm (Twice) that I received on my Raymarine MFD E80 that says "US?????? ( I don't recall the full name so that is what the ? Is meant to represent) and gives me an option to place a waypoint or go to vessel using the soft keys? The alarm clears in about 30 seconds. Can it be related to my previous post on loosing GPS and AIS fix? Can't find it in my Raymarine manual.

I'll try calling Raymarine tomorrow.

Thanks
Marc

 

[Skipper]

It may have been a DSC distress or all-ships call. The US designation may be a channel identifier i.e. vs international.