Why no photos?

[Fenris]

I don't know for sure, but things may be different if a connection attempt returns host unreachable (so not network available at all) rather than a connection being accepted by the remote server and then doing nothing.

I suppose the server could simply do a RSET on the socket to avoid this, if it's present but not actually serving requests.

[AirNav Support]

The difference was our server was online, but the requests through the last few days it was waiting for a response for the data.

When your not connected to the internet it failis to connect straight away and doesn't try again.

[puddy]

Obviously, its best to set a QNH manually

What does the QNH mean and what setting should I have it set to?

Puddy

[Allocator]

Take a look at this for starters:

http://en.wikipedia.org/wiki/QNH

[Allocator]

What happens if the ANRB customer goes mobile without an internet connection? 

I do this regularly Mike.  Basically, it just means that you don't get any Network traffic or updates, but everything that has already downloaded/populated onto your PC will still be available.

So, you will get all the existing aircraft details in NavData.db3, all the routes, all the thumbnail pictures, all the outlines.  Quite frankly, if you've been running your RB for a while and don't go too far from your home location, you're going to see all your 'normal' traffic and you won't notice too much of a difference.

Why don't you just switch off your modem and see for yourself.