In costal water GPS positions should be checked by?(1.0)
A.Visual observations. B.Radar observations. C.Buoys and sea-marks. D.Visual and radar observations.正确答案D
In costal water GPS positions should be checked by?(1.0)
A.Visual observations. B.Radar observations. C.Buoys and sea-marks. D.Visual and radar observations.正确答案D