GeoHack replacement script (source) – Replace coordinates' external links to GeoHack with direct links to a single mapping provider.
Add the following two lines to your common.js (or skin-specific js):
((subst:lusc|User:Evad37/GeoHack_replacement_script.js)) ghrs_mapprovider = "<url>";
ghrs_mapprovider = "http://maps.google.com/maps?ll={latdegdec},{londegdec}&spn={span},{span}&q={latdegdec},{londegdec}";
ghrs_mapprovider = "http://www.openstreetmap.org/index.html?mlat={latdegdec}&mlon={londegdec}&zoom={osmzoom}&layers=B000FTF";