SI
SI
discoversearch

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor.  We ask that you disable ad blocking while on Silicon Investor in the best interests of our community.  If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.
Politics : Politics for Pros- moderated
 Public ReplyPrvt ReplyMark as Last ReadFilePrevious 10Next 10PreviousNext  
To: goldworldnet who wrote (373277)7/16/2010 10:10:20 PM
From: greenspirit  Read Replies (2) of 793866
 
GPS does not work underwater-the radio signals on which it depends cannot pass through water. So submariners have yet to benefit from the revolution in navigation that it allows.

Although it's true radio signals on which GPS depend do not pass through water, the notion that submariners have not benefited from GPS is patently ridiculous. Prior to GPS, inertial navigation systems had position reset by low earth orbit satellites which may only pass within doppler altitude once a day, depending on location. With GPS, a moment at P/D is all it takes to update position and verify INS systems are working correctly. The improvement has dramatically extended the ability to operate in shallow water for extended periods of time and improved the accuracy of INS systems.

Many other advanced tracking concepts would not be possible without GPS, including the worldwide use of AIS (Automatic Identification System).
Report TOU ViolationShare This Post
 Public ReplyPrvt ReplyMark as Last ReadFilePrevious 10Next 10PreviousNext  

HomeMailHotSubjectMarksPeopleMarksKeepersSettings
Terms Of UseContact UsCopyright/IP PolicyPrivacy PolicyAbout UsFAQAdvertise on SI
© 2025 Knight Sac Media.  Data provided by Twelve Data, Alpha Vantage, and CityFALCON News