ACR Electronics NAUTICAST INLAND AIS User Manual page 36

It is possible, that the recipient's Transponder could not receive the message at all, and in
this case the following screen is displayed. It is then recommended to resend the message.
Unsuccessful Message Confirmation (no acknowledgement)
N 1^19' E
----------------------------------------
++++++++++++++++++++++++++++++++++++++++
[ ] AIS1:
[-] AIS2: Sent, but no acknowledgement
++++++++++++++++++++++++++++++++++++++++
User Manual
0^12' |1>0.10|2>1.30|3>1.80nm
Transmission Status
35
Y1-03-0211 Rev. B