"Is using the csv system in the FSX map pop up a way of locating to the exact RTMM
locations or is LittleNav the only way to place a plane to these locations?"
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1st part.. No. If you import the csv files (from dieter's corner) into lnm (or Plan G), for FSX Viewing then you should see these locations on the LNM (or Plan g) map.
(Valid ICAO locations will show up map after the scenery database build.
So the csv files are not for FSX map pop up per say.
So , locations that have been defined with a valid ICAO locations should show up as valid ICAO will be seen on the LNM and also can be found in FSX.
Now if you want to spawn to RTMM non-icao locations, refer to "Using A Starting Point with Latitude and Longitude (How to)" On this page.. (scroll down a tad) as well as how to use the RTMM Waypoints and table that follows with each location having it's Lat/Long and waypoint ID Number. Input to the GPS the Lat/Long or Waypoint ID#.
https://return.mistymoorings.com/n_navigation/#gps.
(The waypoint scenery file (for FSX) has been included in the RTMM FSX Master Scenery package
(RTMM Waypoints) that when you add a way point to the gps, the position will show for you in the GPS.