Its most likely I'm doing something wrong but I cannot for the life of me get the circular IAM release cue to appear on the HUD when I'm trying to use the CBU-105.    
Process I'm using is;   
1) Designate a SPI using the TGP 
2) Select CCRP master mode 
3) Select the CBU-105   
At this point I would expected the see the circular IAM release cue to appear on the HUD but all I see is the vertical bomb fall line. Am I doing something wrong?    
Thanks guys!