Planning "multiple battery" missions?

I have been doing mapping missions with APM and Pixhawk for a while. I often want to map areas that are too large to cover in one flight (as I am sure do many people). I end up planning multiple missions and eyeballing the overlap between each missio

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Hexa purchase decisions

After spending the summer successfully shooting AP with a small quad built from cheap components from GLB, I am getting ready to build a slightly more powerful hexa to carry a larger camera. 

Does anyone have any feedback about pairing this frame:

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