- http://www.geocaching.com/email/?guid=07d7a508-6495-431d-bc37-0f78aa1f48d5
- http://www.facebook.com/GeoCheck
- http://www.geocaching.com/seek/cache_details.aspx?wp=GC7Z523
- http://www.geocaching.com/seek/cache_details.aspx?wp=GC7EFNV
- http://www.geocaching.com/seek/cache_details.aspx?wp=GC22MTR
- http://www.geocaching.com/seek/cache_details.aspx?wp=GC75HZ7
- http://www.geocaching.com/seek/cache_details.aspx?wp=GC5MRX0
- http://www.geocaching.com/seek/cache_details.aspx?wp=GC5KN9K
- http://www.geocaching.com/seek/cache_details.aspx?wp=GC26Q5D
- http://www.geocaching.com/seek/cache_details.aspx?wp=GC5MJBT
- http://www.geocaching.com/seek/cache_details.aspx?wp=GC5RH53
- http://www.geocaching.com/seek/cache_details.aspx?wp=GC48XQC
- http://www.geocaching.com/seek/cache_details.aspx?wp=GC5PAD3
- http://www.geocaching.com/seek/cache_details.aspx?wp=GC1Z09V
- http://www.geocaching.com/seek/cache_details.aspx?wp=GC6FGZF
- http://www.geocaching.com/seek/cache_details.aspx?wp=GC5Nt3G
- http://www.geocaching.com/seek/cache_details.aspx?wp=GC4T3G4
- http://geocheck.org/geo_inputchkcoord.php?gid=11c4fd0813-535c-4b08-a791-c95eb68289e3
- http://project-gc.com/
- http://www.movable-type.co.uk/scripts/latlong-vincenty.html
- http://www.google.com/apis/maps/
- http://www.openwebware.com/products/openwysiwyg/
- http://software77.net/cgi-bin/ip-country/geo-ip.pl
- http://www.famfamfam.com/lab/icons/flags/