Dear Sir,
I have a PhD in Electrical Engineer, and 10 years+ of experience with Digital and Analogue design.
I think you will need to provide must more details about your project though.
If your device is located FAR from the sender, then a GPRS/SMS module will be best. The device will use a small micro-processor and a GPS/AGPS to detect its own location. Also some mechanical rotor to turn the device.
Again, you will need to specify exactly what you need in the device, how it should look, and how it should "turn" itself.
Kind Regards,
Christoph Sonntag, PhD.
South Africa.