So what procussions to do take to make sure that Airnav does not overwite your data
What I do is run a couple of queries each week to look for problems:
1. WHERE
(aircraft."AT" = "...") OR
(aircraft."AT" IS NULL) OR
(aircraft."AT" = "")
2. WHERE
(aircraft.AC LIKE "untitl%") OR
(aircraft.AN LIKE "untitl%")
I maintain a separate field called GA1, which I use to indicate aircraft where I have auto-populated data from GAS.
I have another field called CH, where I put the date that I populated the data from GAS.
Over the last few months this seems to be working well.