Hello all,I notice that on the page for the Ready to Fly hexacopter Arducopter, there is an option for $55 sonar. I do not see this sonar anywhere for the full assemblage kit of the same hexacopter-style arducopter.Is this sonar actually included? Is it necessary? Should I buy it separate if I get the assembly-required kit?Also, are there any other differences between the two?
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