Hi Mike, I think what you're looking for is the Canadian National Topographic System (NTS) grid, which sections Canada according to those alpha-numeric designations. https://www.nrcan.gc.ca/earth-sciences/geography/topographic-information/maps/national-topographic-system-maps/9767 +Evan Evan Thornberry GIS Librarian University of British Columbia Library [log in to unmask] On 2020-06-17, 9:01 AM, "Maps-L: Map Librarians, etc. on behalf of Mike Flannigan" <[log in to unmask] on behalf of [log in to unmask]> wrote: I have a question about Canada topographic map designations. Oak Lake (1:164.042 scale) in CN has a designation of 52 K/5 or 52K05. I want to know what that designation is called. I think it is not the Military Grid Reference System (MGRS), but military people use that designation whatever it is called. Mike