Thank you for your reply. I did post a message earlier but I think I must have had finger trouble as it didn't appear anywhere
I've been looking further into your idea about using the NMEA GPS message output from the RS232 TX of the MGL SP12 GPS.
I have asked Rainier at MGL if this can be used at the same time as the CAN bus, which will connect the SP12 to my TT21 transponder but, assuming this is okay, it would seem you can connect more than one device to the RS232 output.
I am thinking RS232 wire to a USB adapter (makes a change from the other way round) to 'feed' my PAW with GPS position information and, possibly, an RS232 wire to SMA adapter to 'feed' the same position to my Funke BFI57 'back up' instrument (I haven't seen if this adapter is a real thing yet). Any snags with this please feel free to shout out
Now, going a bit techie, does anyone know what baud rate would be acceptable to the PAW box, assuming it was being fed the GPS position as described above? The SP12 usually uses 115200 as the default and, I believe, this allows SDA 2, SIL 3. The baud rates of the SP12 can be changed and, obviously, this would not affect the PAW as it doesn't need those 'certified' numbers but I have no idea if going to a different baud rate reduces the SDA 2, SIL 3 of the SP12. I think I'm talking Greek at the moment
I'll need to sort out the same thing with the BFI57 but one thing at a time.
So, does anyone have a view on all the above or am I on a hiding to nothing and will need to find room for 4 GPS antennas?