An apparatus comprises a sensor that includes an accelerometer and that is configured to both detect movement and generate movement data related to at least part of a detected movement, a positioning unit configured to create positon information by calculating a change in position based at least in part upon the movement data, a messaging unit configured to create a message that is configured to include position information, a transmitter in data communication with the messaging unit and configured to transmit the message and a housing configured to at least partially enclose at least one of the sensor, the messaging unit, and the transmitter, and including a finger grip configured to releasably secure the housing to a human finger.
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