[52Frankfort]

I have a 2000 5200.  When running I am taking on 5-8 gallons of water an hour.  No obvious sources like shaft etc.  I am not taking on water when sitting at the dock.  It is sea water and not from the water tank.  I have looked and looked to try and find the source without any luck.  Needless to say when running it all ends up in the rear compartment under the garage but I have spent time down there while running and the source of the leak is not in that compartment but is coming from somewhere forward of that compartment.  Anybody got any ideas on where I should continue to look for the source?