parkrun Graticule Bingo

There are 64,800 graticules on the globe, very few of which contain parkruns.

6° W5° W4° W3° W2° W1° W0° W0° E1° E2° E
57° N
56° N
55° N
54° N
53° N
52° N
51° N
50° N
49° N
48° N

What is a granticule?