If you have the need for placing the GPS at a distance from the APM2 then this is the solution.  Included are two cables (5cm and 15cm I think) and the MediaTek GPS module.  Firmware loaded and tested on the Planner, all Sensors working well, but not flown.  My cost was about $235.  Would like $210 shipped within US, or write me about outside US shipping costs.  There are some countries I feel uncomfortable shipping to.