In more recent years，（）has been used by civilians in many new ways to determine positions，such as in automobile and boat navigation，hiking，emergency rescue，and precision agriculture and mining.<br>A:GPS<br>B:GMDSS<br>C:AIS<br>D:Navtex

In more recent years，（）has been used by civilians in many new ways to determine positions，such as in automobile and boat navigation，hiking，emergency rescue，and precision agriculture and mining.
A:GPS
B:GMDSS
C:AIS
D:Navtex

出自：海船船员证

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