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Do you tell your kids they have to call you as soon as they arrive somewhere? Do you ever wish you had known a good friend was nearby at noon time, so you could have had lunch together? Or perhaps, you're wondering where your Aunt Tilda is, she should have arrived a half an hour ago, but you hate to call her while she's driving? If any of these scenarios sound familiar, then maybe you'd be interested in one of the location sharing services that are now available. 

These services are permission based, meaning that you have to authorize someone and give them the ability to track your movements. Loopt has been around for awhile.  It requires you, and the person tracking you, to download an application that allows them to see your movements on a map.  It also gives you the ability to geotag your photos. It's compatible with Android and Blackberry devices, as well as the iPhone, iPod Touch, and over a hundred other cell phones.

Google Latitude is another option. This free service can track you within about a half a mile of your location and gives you the option of hiding your location if desired. It is compatible with Android, Blackberry, Windows Mobile 5.0+, and most Symbian S60 devices as well as the iPhone, and iPod Touch.

The newest service is Glympse. This service is also free and permission based, but also allows you to set a time limit on the tracking of your location. Users merely download an application and then send an e-mail link to anyone they wish. The person tracking does not have to download anything to view your movements on computer or web enabled phones. Those who can monitor your movements can see your location more precisely than with Latitude, probably within about a hundred feet, and can even see the speed at which you are moving.

The video below will provide a closer look at Glympse.