A grid reference is the letters and numbers giving an exact spot on a map. Give a grid reference.
You read along the bottom and then up, which is the rule everybody is taught and half forget. A six-figure grid reference puts you within a hundred metres, which is enough for a rescue.
1noungrid referenceThe letters and numbers giving an exact spot on a map.
“He gave a grid reference and the helicopter found them in eleven minutes.”
grid reference is a reference.
Grid plus reference, from the numbered grid printed over an ordnance map.
grid + reference
Etymology from Wiktionary, CC BY-SA
Practised in Camping & Outdoors