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Author Topic:   Raymarine a78
Hoosier posted 12-16-2013 10:04 AM ET (US)   Profile for Hoosier   Send Email to Hoosier  
My eBay HDS-7 is dead so I'm looking at multi-function displays for my 23 Walkaround. The Raymarine A78 looks really good on paper. Would anyone who has had any experience with one care to comment on the unit?
jimh posted 12-16-2013 10:12 AM ET (US)     Profile for jimh  Send Email to jimh     
The Raymarine a78 has pulse-compression SONAR. That is rather cool.
jimh posted 12-17-2013 06:10 AM ET (US)     Profile for jimh  Send Email to jimh     
I suspect that Raymarine continues to use their own cable and connector system for their network wiring. They call this network and the wiring SeaTalkNG. I believe that NG is for "new generation" or "next generation" and it is actually written as a superscript and in lower case. This is very hard to reproduce in plain ASCII text, so I just write it out as SeaTalkNG.

The SeaTalkNG cables are incompatible with the usual and now more universally used DeviceNET cables and connectors for NMEA-2000. If you want to add a Raymarine a78 device to a network that is already wired with DeviceNET wiring appliances (i.e., network T-connectors, drop cables, extensions cables, terminators, and so on,) the best approach is to employ an adaptor cable as the drop cable from the DeviceNET network to the Raymaine a78 SeaTalkNG connection.

As best as I can determine there is a Raymarine part for this. The proper adapator cable to connect a SeaTalkNG device to a NMEA-2000 backbone using DeviceNet is the Raymarine accessory:

DeviceNet male adaptor cable
Connects SeaTalkng products to
NMEA2000 Part number: A06046

This part number was worked out in a long discussion on the topic of interconnecting SeaTalkNG and DeviceNET. See

for the evolution of this advice.

The SeaTalkNG cables and connectors are actually nice wiring devices. They are smaller in diameter than the DeviceNET connectors and devices. If you have to pass a pre-made cable through a bulkhead, a smaller hole can be used for a SeaTalkNG connector than for a Device NET connector.

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