After several Carnival cruises I've gathered that they appear to use Linked Capacity Plus. I'm not sure if there is multiple sites on the ship or if it is set up with multiple sites to roam to other ships...it seems others are seeing multiple sites on a single ship; this would make sense with how large and how much metal there is. The majority of radios I have seen are XPR7550s. Aquatic uses EVX-S24 that have analog and digital channels. The dining room uses bubble pack Motorola radios. The casino has a mix of radios, but must be in analog because I saw old CP200s being used. I have also seen a few R7s, XPR3300e, and XPR7550 IS radios. I saw a channel layout on a base station that had 14 repeater channels and two simplex channels for 16 total. The 14 channels I remember consisted of Security, Engineering, Hospitality, Medical, Fire Patrol, and Embankment.