An entry in Fortnightly Topic Challenge #32: Grid Deduction Hybrids
My dear friend researches and designs canal irrigation systems in a remote desert. He's been missing for two weeks. Members of his research team have reported erratic changes in his behavior prior to his disappearance, and that he's been adding random letters and numbers on the edges of his maps. Here are scans of all the maps I could find in his office.
This last one had no text or north arrow, so I'm not sure if it's oriented correctly.
There were some other strange drawings in his office as well. This was pinned on the wall.
This was found in a secret drawer in his desk.
And this was on a piece of vellum on his drafting board.
Where could he have gone?
At long last, a hint:
as4s4hetic's observation about the number of sides of the shapes corresponding to the number of Yellow/Red cells is a complete (and quite unlikely) coincidence that unfortunately I didn't catch, forming a red herring I think many are understandably chasing. The shapes have a different meaning. Other than that, as4s4hetic is very much on the right track and excruciatingly close to discovering a critical part of how this hybrid is structured.
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