Sharing location information among devices

A computer readable storage device encoded with instructions that, when executed by a first device executing a first instance of an application, cause the first device to carry out operations comprising:

• determining first location data representing a location of the first device;
• displaying a first user interface to a first user of the first device, the first user interface including a representation of the location of the first device;
• receiving second location data representing a location of a second device, the second location data received before the second device is authorized to receive location data from the first device;
• displaying a representation of the location of the second device;
• receiving an indication to access a second user interface;
• displaying a list of users to the first user of the first device;
• receiving a selection of a second user from the list of users;
• and
• in response to user input provided in the second user interface, transmitting the first location data representing the location of the first device for use by the second device, the first location data usable by the second device to display a location of the first device.

A system comprising:

• a location system configured to determine a location of a first device;
• and
• a processor configured for, while a first instance of an application is executing on the first device, operations including:
• determining first location data representing a location of the first device;
• displaying a first user interface to a first user of the first device, the first user interface including a representation of the location of the first device;
• receiving second location data representing a location of a second device, the second location data received before the second device is authorized to receive location data from the first device;
• displaying a representation of the location of the second device;
• receiving an indication to access a second user interface;
• displaying a list of users to the first user of the first device;
• receiving a selection of a second user from the list of users;
• and
• in response to user input provided in the second user interface, transmitting the first location data representing the location of the first device for use by the second device, the first location data usable by the second device to display a location of the first device.