License Search - Ship License Search
The above is part of the US FCC site. You can type in your boats name and search to find out what license it has. I did this with my boat and it turns out the previous owner had a Marine SSB license for the boat which is good until 2017. I also applied for a Marine SSB license and mine is good until 2020.
Does it matter the boat has two licenses and also two MMSI DSC numbers?
As far as your ICOM 7000 pro, I also have that unit and operate on ham bands (have general class). The unit may or may not be unlocked to operate on the ham bands (transmit), if it is locked, an ICOM dealer should be able to unlock the transmit for the ham bands, once you get your license.