Hi Dan,
Speaking from experience I would guess the issue lies with the remote ftp server.
That's not to say AirNav couldn't program in a 'fix' at some time to circumvent issues such as this - I am not sure exactly what command/syntax they use but I would guess the standard 'put' command is utilised - maybe there is an alternative command that could be used?
Is it hosted by your ISP?
Do you have the option to contact them, explain the situation and ask for a work-round?
It could just be a permission change or something that is needed.
If you saw my previous post(s) on the same subject you will see I had
exactly the same problem although I was hosting mine locally.
Changing from the Microsoft IIS FTP Service cured the issue for me.
It is worth perservering with though;
http://www.glyn.me/radarboxI've moved the map over Heathrow for the moment for a friend of mine to keep an eye on although I am based @80 miles away from there - what you see is what I 'see' live on my RadarBox...
Kind regards,
-=Glyn=-