Can't identify coordinate system

[BrendanDwyer]

I have some geospatial data in a text file but I can't identify the coordinate system it is using.  Coordinates were in a format like this: xxxxNx, xxxxxEx, where the x's are integers.  I think it might be a naval or military format, but I'm not sure.

It would look something like this: "3506N8 13922E5"*

Any help would be appreciated.

*not a real example, may not be plottable.

[BrendanDwyer · Accepted solution]

Figured it out. It's a format used by OTH-Gold, as described in Appendix C here:

https://apps.dtic.mil/dtic/tr/fulltext/u2/a405953.pdf 

Enter the position of the report in its original format and precision if possible. Use one of the alternate field contents provided below. Enter the designated field descriptor followed by the data. Data can be expressed in:

Coordinate  System    Field Descriptor

LL:                               Latitude/Longitude

UT:                               UTM (Universal Transverse Mercator)

GR:                              GEOREF (World Geographic Reference System)

The precision reported in this field should reflect the original known precision. The only boundary or restriction placed on the reported precision of data in this field is the field length range. An optional floating decimal is allowed as  appropriate, e.g., LL:304055.55N7-1304055.55E8, UT:45FDK0474, GR:DIQA

[MelitaKennedy]

Thank you for posting that information!