I have a different problem. I also bought US GlobalSat BU-353-S4 and tried using it with OpenCPN. My main computer is an older 17-inch MacBook Pro. It did not
work.
I launched the utility app and got no signal, no satellites and no fix. I was worried that I had bought a lemon.
I also have a newer MBP 15-inch. I downloaded the
software and installed it. This time the receiver worked like a champ. It got signal, satellites and a fix.
The issue is that it did NOT
work on my 17-inch MBP. Does anyone know how I can get it to work on this laptop? I'd really like to use the larger
screen, if possible.