its probably your antenna, try to get closer if possible or get a better vhf antenna .
B) automatic you don't need to do anything.after you calibrate to find gain and correction (ppm) values. the port should be installed by default in opencpn connections.
C) no
https://sailoog.gitbooks.io/openplotter-...ongle.html
https://sailoog.gitbooks.io/openplotter-...eiver.html
https://www.dropbox.com/s/td07mj4x1t3wrbq/ais.rtf?dl=0
B) automatic you don't need to do anything.after you calibrate to find gain and correction (ppm) values. the port should be installed by default in opencpn connections.
C) no
https://sailoog.gitbooks.io/openplotter-...ongle.html
https://sailoog.gitbooks.io/openplotter-...eiver.html
https://www.dropbox.com/s/td07mj4x1t3wrbq/ais.rtf?dl=0