You´re welcome! always glad to help a bit!

Well, you could try to guesstimate it a bit by going into preferences and changing your units to cms. Then each division in the grid would be 1 cm, count them and then grid snap the cameras.

The other way would be using a special node in Maya (distanceBetween) but I certainly don´t feel like I´m the best guy around here to talk about that node.

Hope it helps ...