Hi Detlef,I have the latest version ActiveSkywxRE, it may be slightly different in operation from the free version.
There is an option to down load a single file from the 'Net and use that for your flight, this is similar to FSMeteo's 'Get weather and stay off line'.
AFAIK this down loads all the weather for all areas so as you approach your destination the weather will change to that of the destination. The only thing you will not get is current weather because you are not connected to the 'Net.
If you go to the options, the top of the page has 2 'operations' 'Online/live' and 'Offline/Preset', select 'Offline/Preset'.
I am not sure if you have to hit the 'Auto-download and create new' button to create this world wide weather file or if the 'offline' option does it automatically.
Have a look at the help file for instructions to help with this and sorry if the free version of ActiveSky does not have these options.
I use ActiveSky in online mode which is why I can't give you definite instructions, sorry.
HTH
A Merry Christmas to you and yours and to everyone at flightadventures.
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