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I always thought Grid Dip meters were cool, but it seems a VNA can be used as a Grid Dip meter. Has anyone done this? Does the unit need to be calibrated in a special way? Is the output loop critical to frequency? Or would a few turns be good for anything?

Have not tried with the VNA, but have done with a SNA and RLB. Just need a pickup coil. Here is some info on my blog about that method I used,
Only thing to watch for with the NanoVNA is it only uses about 100 points in its sweep. If your sweep range is too wide you can easily miss a dip.
DuWayne KV4QB

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DuWayne? KV4QB

An associated application can be found on Doug Smith's emcesd.com site:

Yes, it can work!

I missed that one. Thanks for the link!