About Arduplane and pixhawk HIL with x plane 10 issue

sorry , I have some issue about Mission Planner and Pixhawk. While i’m trying HIL(Hardware in the loop) with X plane 10, I used Arduplane as my firmware ,and connected with mission planner, furthermore, I can give command to X plane 10 by remote control with Pixhawk and Mission Planner,but I found out that the Mission Planner couldn’t obtain any GPS signal from X plane 10.Please advise.
thank you.

Benson Szutu