How do I connect my Raymarine (Raytheon) ST40/ST60/ST80...

How do I connect my Raymarine (Raytheon) ST40/ST60/ST80 instrument system to my Nav6plus?

Buy a Raymarine 'Seatalk to NMEA bridge' from your local dealer. This will convert the instrument data present on the Seatalk bus into the NMEA format that the NAV6plus can understand.