Panasonic 3.0 - Manual (Page 40)

EchoMap v3.0
40
NexRAD radar composites incorporate extensive processing on the
ground. Updates arrive at the Echo Flight Network Center every
five minutes. The age of the weather update returned to you
greatly depends on when your request arrives at the Echo Flight
Network Center. For instance, your request might arrive 4
minutes after the update was posted. It takes roughly two
minutes to send the update through the ORBCOMM system. Thus,
this particular update would arrive to you and the WX indicator
would display it as six minutes old.