DJI Innovations

New DJI NAZA-M V2+GPS+PMU V2 +LED Module Multicopter Multi-rotor Autopilot system Combo Set 

DJI IOSD On Screen Display for WKM and ACE Flight Telemetry Soodohobby
With DJI mature reliable sensor technology, iOSD can collect precise & real-time flight data, transmitted to the ground end via video link in most clear digital and graphical expression way. It not only brings security to your science and technology experience, but also let your FPV dream get released with more joy.
The iOSD multifunctional integrated module has a built-in BEC module, when coupled with DJI profess

FPV DJI WooKong-M complete flight control system DJI Wookong WK-M GPS Multi-Rotor Stabilization Autopilot System for multi-rotor platforms

NAZA GPS upgrade kit. Fully plug and play GPS upgrade kit for DJI NAZA multirotor controller.
With this upgrade, your NAZA will have GPS hold, RTH, head lock and other cool functions of WooKong M from DJI, and the price is just 35% of a WKM.
Really a nice deal.
Download the lastest assistant software to use the GPS function from 
http://www.dji-innovations.com/products/naza-multi-rotor/downloads/