Converts a OS grid ref to a lat/long hyperlink to geohack.
<nowiki>{{</nowiki>#invoke:{{BASEPAGENAME}}|main|SK135733<nowiki>}}</nowiki> ← Two-letter code interpreted as OS grid ref in Great Britain
<nowiki>{{</nowiki>#invoke:{{BASEPAGENAME}}|main|O169318<nowiki>}}</nowiki> ← One-letter code interpreted as Irish OS grid ref
<nowiki>{{</nowiki>#invoke:{{BASEPAGENAME}}|main|439668_1175316<nowiki>}}</nowiki> ← Two digit strings interpreted as easting/northing in meters in Great Britain
<nowiki>{{</nowiki>#invoke:{{BASEPAGENAME}}|main|i88888_99999<nowiki>}}</nowiki> ← String starting with i is easting/northing in meters in Ireland
<nowiki>{{</nowiki>#invoke:{{BASEPAGENAME}}|main|SK135733|Miller's Dale<nowiki>}}</nowiki> ← Second argument is used as link text
<nowiki>{{</nowiki>#invoke:{{BASEPAGENAME}}|main|SK135733_scale:25000_region:GB-DBY<nowiki>}}</nowiki> ← extra underscored parameters passed to geohack
Also converts from lat/long back to OS grid ref:
<nowiki>{{</nowiki>#invoke:{{BASEPAGENAME}}|WGS2OSGB|53.256538|-1.799102<nowiki>}}</nowiki> → SK1350073300
<nowiki>{{</nowiki>#invoke:{{BASEPAGENAME}}|LL2OS|53.256538|-1.799102<nowiki>}}</nowiki> →
<nowiki>{{</nowiki>#invoke:{{BASEPAGENAME}}|LL2OS|53.256538|-1.799102|scale:25000<nowiki>}}</nowiki> →