QTVLM and Raymarine Autopilot

You don't want "Retransmit all" since that will retransmit all NMEA data, creating a loop.
In the receiving tab you should leave only the useful serial port (I guess COM2) until it works.
You can also try the option "With NMEA2000 compatible names".

Here comes the fuzzy part ...!!!
GARMIN AIS is on COM7
SILVA NEXUS + other senders are on COM1 (baud rate 4800)
qtvlm output is on COM2 to all listeners

Now .... if I check off the 2retransmit all" on my standard horizon DSC radio I don't get the position.
According to the manual it accepts GLL, GGA, RMC and GNS and qtvlm does output RMC with retransmit all either checked or unchecked, but if I uncheck it then the vhf does not receive position.

What exactly is arriving on the various COM ports ? For me you have a mess in the connections and the sentences qtVlm sends for WP never arrive to where they should. The problem is not in qtVlm, I think.