Hole pattern position to a plane only

Looking for interpretation of the attached true position call out for a 4-hole pattern. I am not well versed in GD&T but know enough to get myself in trouble.

I've staged the part and aligned with the bottom as -A- (level and origin Z).
I probed and created 4 cylinders, then created circles at the intersections of the cylinders and -A- respectively, then used the circles to create one circle -B- and translated X,Y to -B-.
I probed plane -C- and controlled rotation around Z with plane -C-.

My question is; How is the true position calculated / reported in this case, when there are multiple holes making up one datum in reference to a plane only?

Thanks.

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JimCMS 11 months ago

I'm using Geotol in version 2020 R1. The part is a molded motor cover that mounts to a block. Datum -C- is a plane containing four threaded inserts and a clearance hole of which I am uncertain what it connects to.

I'm uncertain how to calculate the position. Do I use the basics and report a position result for each hole?
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JimCMS 11 months ago

I'm using Geotol in version 2020 R1. The part is a molded motor cover that mounts to a block. Datum -C- is a plane containing four threaded inserts and a clearance hole of which I am uncertain what it connects to.

I'm uncertain how to calculate the position. Do I use the basics and report a position result for each hole?
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