No BS GPS is a standalone watch app (no iPhone needed) that simply just shows your current GPS coordinates in a variety of formats in large print.

Coordinate formats available include:
Decimal Degress (DD)
Degrees, Decimal Minutes (DDM)
Degrees, Minutes, Seconds (DMS)
Military Grid Reference System (MGRS)
Universal Transverse Mercador (UTM)

This app also shows your current altitude/elevation and your watch GPS's current horizontal and vertical accuracy.

Accuracy and altitude can be displayed in feet or meters.

If you're a member of the military who needs to immediately know their coordinates with no hassle, you will also find it handy that you can pause the GPS and freeze your currently displayed coordinates.

Hunters and fishers, keep track of the GPS coordinates of your favorite hunting and fishing spots.

Geocachers, use this app to easily locate your geocaches.

Apple Watches use the WGS 84 reference frame datum. See https://developer.apple.com/documentation/corelocation/cllocationcoordinate2d