Hi
SignalK newbie here as well. I have been experimenting a little bit. Are you sure that the derived-data plugin is active? You should see it in the Dashboard. In the Databrowser, do you see any data with derived-data as Source?
If the plug-in is working, activate the Debug log. See of any errors show up when the plugin is started or running
Have you found the folder with the scripts (signalK derived data/calcs ; be sure that 'show hidden files' is on)
You could add some debug lines to the script like: console.log('value of awa is:', awa)
They are added to the log so you can see if any data is missing