Airnav radar box version 6 and Airnav decoder.

[acars45]

Good morning all I'm running Airnav radar box with version 6.00 software.
I'm also running Airnav decider 2.1 version.
On radar box you can tick conect to Acars decoder but nothing is coming up on radarbox
Is there anything in doing wrong
Look forward to your repiles
Paul