A method obtains a geographical position of a mobile device, which comprises a Bluetooth transceiver and a storage unit for storing an offline map. The mobile device establishes Bluetooth capability in order to enable a Bluetooth connection with the mobile device. The mobile device, via the Bluetooth connection, requests geographical coordinates using two bits of a Frequency Hopping Synchronization data packet of the Bluetooth protocol. The mobile device, via the Bluetooth connection, receives geographical coordinates, and maps the received geographical coordinates to the offline map in order to obtain the geographical position of the mobile device in the offline map.