android phone quadcopter simulator

I recently purchased 'QuadcopterFx Simulator' App via iTunes prior to purchasing a DJI Phantom. I am struggling to understand what 'Course Lock' and 'Home Lock' does - can anyone help please?
 
Home lock and im open to correction is when gps is on pulling back on the right hand stick brings it back to where it took off from no matter what direction its facing
 
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