RTKGPS动态吃水改正
RTKGPS about the dynamic correction of water line
变吃水负载率
load rate in changing water depth
吃水改正方法
method about the correction of water line
到达时的淡水吃水
fresh water arrival draft
抵达时淡海水吃水
brackish water arrival draft
换能器吃水改正
correction of transducer draft
碱水吃水度
salt water draught {= SWD