step one - simplify markers
we need the indexed collection of vessels - make it so
remove reliance on vessel called ownship
removing remaining instances of vessel.ownShips.  Some spatialView refactoring
removing remaining instances of vessel.ownShips.  Some spatialView refactoring
capture missing ownship instances
Merge pull request #23 from IanMayo/features/ian/refactor_ownship

Done.