Indicating location of a lock

A method for indicating the location of a lock with a mobile device, which mobile device sends and receives a radio signal and communicates with the lock via radio-frequency communication, wherein the lock is a lock that is openable electrically and by means of radio-frequency communication, wherein in the method:

• the direction and/or strength of a radio transmission sent by a lock is measured with a mobile device,
• the location and/or direction of the lock in relation to the mobile device is determined on the basis of the measurement, and
• the location of the lock and/or the direction towards the lock is indicated with the mobile device to the user of the mobile device.

A mobile device, which is adapted to send and receive a radio signal and to communicate with a lock via radio-frequency communication, wherein the lock is a lock that is openable electrically and by means of radio-frequency communication, wherein:

• the mobile device is adapted to measure the direction and/or strength of a radio transmission sent by a lock,
• the mobile device is adapted to determine the location and/or direction of the lock in relation to the mobile device on the basis of the measurement, and
• the mobile device is adapted to indicate to the user of the mobile device the location of the lock and/or the direction towards the lock.