AIS reception in Shotley

Losing the will here. Been in touch with Garmin all along, they are trying to help but i wish they would pay attention. I keep explaining things and they go off at a tangent, like speaking to a foreign call centre.

They just sent me some software to see if it's my plotter software that's at fault. Despite me telling them i've used several plotters and about 5 different NMEA readers. To top it off, they sent software for their AIS 600, mine's a VHF 300i AIS.
 
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