So, is now an appropriate time to delete all records from our local navdata routes table?
Don't be too hasty in deleting your local routes database, I'd hang on for a few days at least.
I don't know if the routes currently being returned by the server are the same as those in AirNav's master routes database (since I don't understand what this "24 hour refresh" process is all about).
Having said that, I've just run a random sample of Heathrow flights against the server.
Of those, 10% are returning routes which are either wrong/out of date (e.g. BAW21P/BA603 LIRP-EGLL) or simply blank (e.g. BAW29CE/BA341 LFMN-EGLL).
Of the incorrect/blank routes, 75% are alphanumeric flight numbers.
As I said, I don't fully understand the update architecture, so it's possible that over the next few days the refresh process will populate all those alphanumerics.
I'll run another test in a few days time.