Geopolix Client 0.95

the author of this app says:

Use your Windows Smartphone in combination with www.geopolix.com and you can share your geographical location with friends, family, business colleagues and every other community you can think of. It is completely up to you to share your location whenever, wherever and with whomever you want. If one of your friends gets in range you will be notified and you can communicate with your buddies through the integrated instant messaging client.