It is bad policy to feed GPS data through a chartplotter in order to feed another device for obvious reasons. A GPS receiver with NMEA 0183
output is a talker so several listen devices can be connected to it. This is how GPS data from a single
source should be distributed.
In the scenario we have been discussing, this would mean that NMEA out
from the single connector on the E series is not needed. For the record
it will still output any NMEA it is set to send but obviously @ 38400 baud, meaning it may still be used for this purpose with equipment
that can work at the higher speed.
pas63 is using a Raymarine GPS mushroom to feed his E series MFD & if
(as is quite likely) its set to send out data in Seatalk format, we have a slight problem.
1) Set Raymarine mushroom to output NMEA 0183
(its configurable to allow this) which simplifies things no end. We then have a GPS source which we can connect to several devices including feeding the E series MFD through the the mpxr mentioned above to restore its position data, as well as the GX2100 for DSC & AIS display.
2) Buy the Raymarine Seatalk/NMEA converter (he may have one already) & extract the GPS data in NMEA 0183 format from the Seatalk bus for distribution as required. As well as probably costing money
I think this solution less elegant than the first though.
BTW I don't like the Brookhouse/Raymarine hook up - there are too many flaws & limitations as they point out themselves. Just their basic multiplexer with speed conversion would be fine.