I am getting ready to update/add to my existing navigation instruments. At present I have st6000 (raymarine) auto pilot, st60 water speed, fishfinder by Garmin(used for depth indicator only). Hand held Garmin 76 GPS unit.I also have a vhf by icom hand held and a standard vhf below deck. I would like to get setup to cruise in the Bahamas, and possibly later in some of the other islands. I am looking for suggestions on what equipment to add to existing. Should I get compatible items that can be networked? Do I buy one of the multi function units that several functions can be viewed on to save cockpit space? Should I plan to install below deck, in the cockpit, or a combination of both? I need advice from some of you more experienced sailors as this seems to be a fairly expensive investment.( or a bigger hole in the water to deposit my money into)From what I have at present, what would be the order of importance of the suggestions? I will probably spread the project over a year or two.