0 the unit of altitude.. Posted by Peter Kweon on November 27, 2012 at 9:54am what is the unit of altitude?? m, ft, inch??and when you land... nere is no altitude needed??thanks... You need to be a member of diydrones to add comments! Join diydrones Email me when people reply – Follow
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sorry.. nere --->>> there
and when you land... is it necessary to have a sonar range sensor attached facing down to have smooth landing??