The FHS soc (see website http://www.isle-of-man.com/interests/genealogy/fhs/ have done (I think) all MI's for Arbory - if my memory serves me ok (I photographed a number of these for my CD though mostly concentrating on older graves) there was a sort of time-line running through the yard - however the FHS pubs also give a map and grave location - many parish churches (eg Braddan) have a copy of this map at the rear of the church - also the Manx Museum have copies - they are also on Mormon microfilm