Inspired  by a previous posting on this topic, I am successfully using Expedition to send PGNs via Actisense NGT-1 onto the NMEA2000 network, which I can then view on my Garmin GNX20 displays – the smaller units that don’t allow the custom channels.   This allows me to have Expedition data on these smaller displays as well as having custom data showing on my mast mounted larger GNX120 displays.
 
I am confident that the TWD displayed on the GNX20 is that from Expedition – the unit is set to the Expedition data source and if for example I change the AWAOFFSET in Expedition, then the TWD on the GNX20 changes accordingly - so I think it is not showing an internally calculated value.
 
The problem is that the TWD on the display is always different to the damped TWD number within Expedition, or indeed the same number sent as custom data to my GNX120 displays.  I have checked the “send damped data” box in the Actisense NMEA2000 PGN dialogue box, so I was hoping this meant that the number being sent to the network would be the same damped number that is within the program at any given time.  The problem is that it is not, it seems to be an undamped number.  I could damp it using the facility in the GNX20 display, but the Garmin damping appears to be not the same as Expedition and side by side comparison reveals large differences.
 
So, I suppose my question is, does the “send damped data” option work, as clicking it seems to make little difference to what is shown on the display for TWD.

Thanks in advance for any insight.