[rirvine]

Guys: I have been through these hoops with RM. The RM box for Seatalk -->> NMEA -->> RS232 is a E85001. The problem with it is that it does not convert all the fields in a Seatalk sentence to the corresponding NMEA fields. If you search the web you will other boxes that convert Seatalk -->> NMEA -->> USB (even bluetooth). Many of these have both a Seatalk and one or more NMEA inputs which give you great connection flexibility. You can see a block diagram on my set up at:

http://www.flickr.com/photos/crews_nest/549486483/

Ray