To solve this letterbox, go to the posted coordinates, where you will find some letter boxes.
Use them to solve. N 51° 19.AB’ W 114° 29.DE’
A - Box 1 Column 1 - 2nd number from the bottom
B - Box 1 Column 2 - bottom number multiplied by 3 then add 1
D - Box 2 Column 2 - 4th number from top minus 6
E - Box 2 Column 1 - 2nd number from the bottom multiplied by 3