G-code parameters 5420-5428 are relative, not machine coordinates. There 
is an error in docs 
http://www.linuxcnc.org/docs/html/gcode/overview.html#sub:system-parameters
#<_x> - Return current machine X coordinate. Same as #5420.

While in 
http://www.linuxcnc.org/docs/html/gcode/overview.html#_numbered_parameters_a_id_sub_numbered_parameters_a
it is right:
5420-5428
Current relative position in the active coordinate system including all 
offsets and in the current program units for X, Y, Z, A, B, C, U, V & W, 
volatile.


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