XL-MaxSonar 20cm closest distance?

Hey guys I am using the arducopter 2.0.48 release.  I have enabled the sonar in the APM planner hardware config.  I have booted into CLI mode and went to test >> sonar.  If the quad is on the ground I get 20cm.   When its more like 5cm.  I can lift it and it will go up.  But it seems like its all off.  Its away from speed controls and the IMU.  Is there anything special I need to do to get this to work right?  Its almost like its using a different voltage settings to determine its height than say the other sonar modules?   Any thoughts?

 

Riley

 

Heres my quad.

6238976918_b459aa2e64_z.jpg

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