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  1. Hi, We are at an advanced stage of readiness for GDA2020 implementation and are now starting to seriously consider implications of the dynamic ATRF datum - applicability, use and support. Can you please advise of any latest official developments in this space. Our current thinking is that we will perform a bulk transformation once a year (e.g. GDA2020 transforms to a 2021 epoch), living with the, up to, 7cm shift during the year (our highest level of positional accuracy required is 0.25m). Thanks, Mark