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Regional averages are only as good as the samples behind them. If all four of your grandparents come from the same area, your coordinates can make that region's reference average measurably more accurate, for everyone who tests after you.
This is what makes a sample represent a place rather than a personal mixture. If your grandparents come from four different regions, your coordinates sit between them all and would pull the regional average away from the real population. Mixed ancestry is fascinating, it just can't serve as a reference point.
Only coordinates produced by Davidski's own Global25 pipeline can be used. Every population in the panel was built that way, so mixing in coordinates from another source would compare things that aren't on the same scale.
Don't have yours yet? Order them from Davidski's official request service: g25requests.app — order your Global25 coordinates ↗
Not accepted: simulated coordinates, K36-derived conversions, unscaled values, or coordinates from any other pipeline. These are rejected automatically.