I have coordinates from a Sabine River Authority survey map created around 1967. I am trying to get the coordinates to modern GPS coordinates to use in Google Earth or similar programs. I thought the coordinate system was NAD27 but my longitude is deemed invalid by the conversion programs I have tried. I have spent a couple hours searching via the internet. I thought at this point I would turn to our FReeper knowledge bank. The Latitude is listed as: N.88°54'23.4"W. The Longitude is listed as: N.00°21'52.7"E. The letter designation do not make sense to me, but with the multidude...