Add more than one pair of fields to a GMap?

Hello,
I have two sets of latitude and longitude pairs. The first pair is the precise location and the second is populated with Compute Fields using PHP's round() function to limit the field to the nearest hundredth of a degree (explanation below*). Is it possible to add both sets of these coordinate pairs to a GMap (using fields, not location) and have them show up? My goal is to then limit who can see which coordinate pairs (precise or obfuscated) with the Field Permissions module.

*This is for a fossil specimen database that will be live online. To make it possible for the public to see where (in general) specimens were found, we are making obfuscated lat/long data available, without allowing them to see the precise locations of the fossil localities. This prevents people with malicious intent from bothering landowners, collecting without a permit on federal lands, or even going so far as to steal fossils in the dead of night (yes, it does happen). Vetted researchers will be assigned a Role that will allow them to see the actual positions of the localities in order to make plans to revisit or analyze them using Google Earth, other GIS software, or remote sensing.