IMPROVING POSITIONAL ACCURACY

TIME NETWORK LOCAL

NETWORK SPAN ACCURACY ACCURACY

NAD 27 1927-1986 10 Meters First-Order (1 part in 0.1 million)

NAD 83 1986-1990 1 Meter First-Order (1 part in 0.1 million)

HARN 1987-1997 0.1 Meter B-Order (1 part in 1 million)

A-Order (1 part in 10 million)

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