[C320-list] Sending NEMA 0183 Data from Garmin Charplotter to Raymarine Autopilot

[Angus Henderson]

 On June 14th Joe Tamucci submitted a post with the following title, part of which is reproduced below.  

I also recently purchased a Garmin chart plotter, a 54dv and have been thinking about how to get it talk to the Raymarine Authelm.  Joe refers to his AH unit as an ST-5 control head.  I have a 4000+ and was wondering whether this is the same thing?

Also, referring to the excerpt below I am struggling to understand what the “Raymarine computer” is?  I am familiar with the control head, the wheel unit and the flux gate compass but not the “computer”.  I would appreciate some help understanding this.


 3). Although the ST-5 control head has a NEMA input, it cannot be used 
   to input position data.  You must use the NEMA port on the Raymarine 
   computer.  I assumed the control head NEMA 0183 input port would work, 
   and the Raymarine tech agreed with me.  NO!  You must go straight to 
   the computer. 

Thanks

Angus Henderson
Hull# 999