Hi Bill,
First of all, once you install the new software you have to go into the settings page and turn on the NMEA output. That is the easy part. The real problem is that once you turn on the XM weather feature the serial port stops sending NMEA info.
The problem is not a software issue. The Avmap unit has only one serial port and when the XM weather feature is activated, the only information in the serial stream is the proprietary XM data that the WxWorx reciever uses. No NMEA sentences are sent.
Another funny quirk is that if you turn on the weather feature without a weather receiver connected you'll never get the NMEA info back. This is because the weather receiver must be connected to the unit in order to turn the weather feature off. The avmap unit sends a receiver shutdown message and will not release the serial port until the receiver responds. Once the xm weather is turned off the serial port streams NMEA sentences again. The bottom line is that you can't have the Avmap receive weather info and send NMEA info to the dynon at the same time.
I talked to Dan at Avmap about this and his response did not inspire any confidence that they will find a solution for this. So, for the immediate future the best you can do is wire the serial port through a switch to select either the weather receiver or the Dynon unit. Then, in addition to throwing the selecter switch, you must turn the XM weather on and off as well.
It is both frustrating disappointing. I'm thinking I now have to switch to a Garmin 496 or a panel mount gps. Whick kinda stinks because I really like the 7" screen on the Avmap.
Ken Pavlou