"Linking" Armatures together I have created kind of a.. Robot in blender, a legged boat, complete with bones and all.

I have also created, in the same project a character, rigged and ready to go.
In my animation I would like for the character to stand on the boat. Is there a way for me to attach the character armature to the root bone of the boat and still have the character armature fully functional within itself?

Sorry for bad phrasing. I am having a hard time explaining my issuse.
You could give your robot armature a Child Of constraint and choose the root bone as parent, don't forget to click the constraint Set Inverse button so that the armature stays where it was.