Teamplaid:UF-coord-classes
To always display coordinates as DMS values, add this to your common.css:
.geo-default { display: inline }
.geo-nondefault { display: inline }
.geo-dec { display: none }
.geo-dms { display: inline }
To always display coordinates as decimal values, add this to your common.css:
.geo-default { display: inline }
.geo-nondefault { display: inline }
.geo-dec { display: inline }
.geo-dms { display: none }
To display coordinates in both formats, add this to your common.css:
.geo-default { display: inline }
.geo-nondefault { display: inline }
.geo-dec { display: inline }
.geo-dms { display: inline }
.geo-multi-punct { display: inline }
If CSS is disabled, or you have an old copy of MediaWiki:Common.css cached, you will see both formats. (You can either clear your cache or manually refresh this URL: [1].)
To disable display of the blue globe adjacent to coordinates, add this to your common.js
var wma_settings = {enabled:false}
Note that this will disable WikiMiniAtlas
See also Wikipedia:Manual of Style (dates and numbers)#Geographical coordinates.