VHF Handheld/Fixed Communications

[HAT-ATTUDE]

I am looking for a VHF radio with all the basic functions (DSC, Hailer,Fog horn,GPS connection, etc) and also with the capability of handling multiple external speakers for intercom and announcements as well as communicating directly with crew member using a handheld unit (assistance in docking).
The hand held unit would also act independently when necessary. Which fixed and which handheld models will accomplish this?