Hi Bob,

> Monitor the OSHIP count. If the counter is increasing, you at least have sucessfull communications between the Navworx unit and the EFIS.

Great - Thx for that.

> Unfortunately, the only real way to validate the output of the Navworx unit is to fly with a laptop on the maintenance port. The is a real PITA unless you have a second person to handle this task. You can see the status of just about everything rom the laptop.

Did you have to use their 'UAT Console' program to monitor this? I've not looked at the serial port in "raw" mode to see what, if anything, is being sent out. If that's the case, it'd be easy to setup a serial logger.

> It turned out my issue was neither due to the EFIS or the Navworx, but to an intermittent power issue. I wouldn't have believed it until I had the laptop in the cabin.

Interesting. Would you mind describing your symptoms?

/\/elson