1979 . , . - . . , . , .
, ( , ENC, RNC) , . DGPS, 1-5 . , 1980 . 20 (=0.95). . , , 1980 , , DGPS. 13 , - 5 . 95% .
, , 10, .
WGS84 , , GPS . . . , .
, .
. , , . , . , , , . ECDIS Crt (), RCDS - .
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. , . , . . ECDIS (chart autoload), .
, , . . , . " ", () , "" "" ( "PA"- Position approximate "PD"- Position daubtful) , . . , . .
- .
, , . ECDIS .
.
, ECDIS .