Charting Your Position
From UFStarfleet LCARS
We have established a simple method for starship crews to follow in order to establish their position in space.
This can be done by firstly, using one of the two the Master Sector Maps to establish which sector of space you are in...
Once you have established which sector you are in, the next step is to refer to the Subsector Grid reference to identify whereabouts within the sector you are.
Using the example below, it becomes clear to see that the Deraxon system is in Sector 002D (Unall), subsector 64