Avidyne IFD540 Pilot's Manual page 155

Datalink Status Page
The "Datalink" selection will be available if the IFD has been
properly configured to integrate with a compatible on-board
satellite weather/audio system (see the IFD product page on
www.avidyne.com for a list of currently supported systems).
This page has two distinct sections – the upper part displays the
various weather products supported by the datalink system and
subscription level with their age and receipt status; the lower part
is a legend that defines the various symbols used in the datalink
data depictions on the maps. Note that forecast products (e.g.
winds aloft) display the forecast time, not the data receipt age.
Dashed data is not authorized for that subscription level and "Not
Rcvd" data has not been received.
Datalink Status Page
AUX Pages 4-47