默认题库 - GPS、DF及LC的使用

A. Decreasing loran readings on 9960-W
B. Visual bearings of Montauk Point Lt. changing to the left
C. Increasing bearings of Southeast Point Light
Decreasing sounding

查看答案

单选题

Before a magnetic compass is adjusted certain correctors must be checked to ensure that they are free of permanent magnetism. These correctors are the（）.

A. fore-and-aft and athwartships magnets
B. dip needle and heeling magnet
C. heeling magnet and Flinders bar
D. Flinders bar and quadrantal sphere

查看答案

单选题

Deviation which is maximum on intercardinal compass headings may be removed by the（）.

A. Flinders bar
B. transverse magnets
C. fore-and-aft magnets
D. soft iron spheres on the sides of the compa

查看答案

单选题

Most GPS receivers use the doppler shift of the carrier phase to compute（）.

A. Latitude
B. Longitude
C. Speed
D. Time

查看答案

单选题

Due to GPS roll over of the clock cycle，GPS receivers may give the wrong time and position or may lock up permanently on（）.

A. 21-Aug-99
B. 21-Sep-99
C. Octoer 31，1999
D. 31-Dec-99

查看答案