Patent ID: 7006835

Claim:
In a position information providing system comprising a portable communications device capable of measuring position information representing the position of the device based on position data received from a plurality of position reference stations arranged on a satellite and/or the ground and transmitting the position information by radio communication, and a position information providing device capable of receiving and holding the position information transmitted from the portable communications device and transmitting the position information to one or a plurality of terminal communications units, a position information providing method comprising the steps of: causing the portable communications device to discontinue the position information measuring operation in response to a position measurement discontinuing manipulation by a user or upon arrival of a position measurement discontinuing time set by the user; and causing the position information providing device to check, in response to a position information request command from the terminal communications unit, whether the position information as to the portable communications device is held by the position information providing device during a specified period of time before the reception of the command until the reception and to transmit the position information to the terminal communications unit only when the position information is found to be held during the specified period.