So a GQ 2000 rating may be about 2.8d OGS[year 2018], a GQ 2100 rating may be about 4.8d OGS[year 2018] and a GQ 2400 rating would be far above amateur level (~13d OGS[year 2018]?).
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So a GQ 2000 rating may be about 2.8d OGS[year 2018], a GQ 2100 rating may be about 4.8d OGS[year 2018] and a GQ 2400 rating would be far above amateur level (~13d OGS[year 2018]?).