NTUN is in meter or cm

Hi guys,

I come across NTUN in an Arducopter APM 2.6 log, firmware 3.1.5 and wonder what the unit of the variable WPDst. I found it says in cm here: http://copter.ardupilot.com/wiki/downloading-and-analyzing-data-logs-in-mission-planner/

but in rover i

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