单项选择题
A.Navigational satellites B.Loran C.Omega D.Any of the above
The loran lines drawn on navigation charts represent（）....
单项选择题The loran lines drawn on navigation charts represent（）.
A.Ground waves B.Skywaves C.Either ground waves or skywaves interchangeably D.An average between ground wave and skywave positions
The line connecting the Loran-C master station with a s...
单项选择题The line connecting the Loran-C master station with a secondary station is called the（）.
A.Focus line B.Base line C.Side line D.Center line
The information received by AIS will be displayed on（）....
单项选择题The information received by AIS will be displayed on（）.
A.DCU B.UTC C.ENC D.MENU
