Identifying grid system in Canada

Question

I'm trying to identify this grid system that consists of two letter followed by two numbers.

If it helps I know GU37 is defined by the following vertices:
  Lat (North)   Lng (West)
1 48° 30' 00"   64° 00' 00"
2 48° 40' 00"   64° 00' 00"
3 48° 40' 00"   63° 50' 00"
4 48° 30' 00"   63° 50' 00"
5 48° 30' 00"   64° 00' 00"

Point references are based on the geodesic system North American Datum 1983 (NAD83)
My ultimate goal is to be able to convert a point using PostGIS to a grid name.
Given that I know an origin - GU37 - and I know this is a 10 minute grid (I think) - is this something I could generate?

Adam · Accepted Answer

I was later able to find a doc that contained the grid specifications. It is indeed a 10 minute grid that starts at (FX1) at 52°30'00"N 70°00'00"W.
https://imgur.com/a/8dTJczf
EDIT: My finished grid in QGIS after I added in the lobster fishing areas (LFAs) in the Gulf/Scotia-Fundy region, everything of which has been overlaid on top of the NAFO zones:

What a nightmare it is asking DFO for geospatial data, or even DMS coordinates. This exercise was WAY harder than it needed to be.

Identifying grid system in Canada

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