Find my Mac, iPhone couldn't locate my MacBook Pro!!

Hello All,

I found out that "Find my iPhone" on iCloud profile doesn't locate my MacBook Pro or sometimes it locates it completely wrong and I mean by completely wrong it locates it in different city that I visited few months ago. How to fix this? I want to be sure that I can always locate my mac! Also I wonder why on my iCloud profile it call it "Find my iPhone" and not "Mac" although I don't have iPhone and didn't connect to iCloud with iPhone before! Thanks for everybody.