Apparatus for display of digital content associated with a location of a Node in a wireless communication area. A user interface is generated with a digital representation of content associated with a physical tag or other Node. The user interface includes interactive portions based upon positions in the wireless communication area. The interactive portions may be activated to display the digital content associated with the physical tag in a user interface.

A method includes: sending at least two sound wave signals through a loudspeaker; receiving, through a microphone, at least two sound wave signals from a second electronic device, and determining a first receiving result of receiving the at least two sound wave signals; determining a first possible angle value between the second electronic device and a first electronic device based on the first receiving result; and receiving a second possible angle value between the first electronic device and the second electronic device that is from the second electronic device, and determining an actual angle between the first electronic device and the second electronic device based on the first possible angle value and the second possible angle value; or sending the first possible angle value to the second electronic device, and receiving an actual angle between the first electronic device and the second electronic device.

A controller (210) for tracking an interventional medical device (252) in three dimensions includes a memory (212) that stores instructions, and a processor (211) that executes the instructions. When executed by the processor (211), the instructions cause the controller (210) to execute a process. The process includes determining (S320/S420), based on an elevation plane in an ultrasound X-plane mode, a first two-dimensional location of the interventional medical device (252) in the elevation plane. The process also includes determining (S320/S422), based on an azimuthal plane in the ultrasound X-plane mode, a second two-dimensional location of the interventional medical device (252) in the azimuthal plane. The process moreover includes determining (S330/S430), based on the first two-dimensional location and the second two-dimensional location, a three-dimensional location of the interventional medical device (252). Finally, the process includes modifying (S340/S440) ultrasound beam patterns fired in the ultrasound X-plane mode based on the three-dimensional location of the interventional medical device (252).