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Grids, levels, and (reserved) refplanes don’t project datums — they are datums, declared directly (in carrier terms: a carrier with no recipe). Grids: plane, normal x̂ (vertical) or ŷ (horizontal). Placement: a station on its axis — vertical at 0', horizontal at 30'.

Parameters

Datums

Roles

None — this category draws no parts of its own.