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navigation acronyms, abbreviations and definitions - International ...

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NSCC Navigation System Control Centre (Galileo)<br />

NSE <strong>navigation</strong> system error<br />

NSGU Navigation Signal Generation Unit (Galileo)<br />

NSIDC National Snow <strong>and</strong> Ice Data Centre (US)<br />

NSL NATS Services Ltd<br />

NSO National Solar Observatory (Tucson, USA)<br />

NSP <strong>navigation</strong> signal processor<br />

NSRS National Spatial Reference System (US)<br />

NSTB National Satellite Test Bed (WAAS)<br />

NSW no significant weather<br />

NT net tonnage<br />

NT new technology<br />

NTD National Topographic Database (UK)<br />

NTDS Navy Tactical Data System (US)<br />

NTE not-to-exceed<br />

NTF National Transfer Format (OS format to transfer digital mapping)<br />

NTIA National Telecommunications & Information Administration (US)<br />

NTM (NtM) Notice To Mariners<br />

NTP network time/timing protocol (eg NTPv4 in 2008)<br />

NTS National Travel Survey (UK DTLR)<br />

NTS Navigation Technology Satellite<br />

NTSB National Transportation Safety Board (US)<br />

NTSC National Television St<strong>and</strong>ard Committee (US/Japan TV st<strong>and</strong>ard)<br />

NTSC National Transportation Systems Center (US)<br />

NUAA Nanjingl University of Aeronautics & Astronautics (China)<br />

NUC not under comm<strong>and</strong><br />

NUMAST National Union of Marine, Aviation & Shipping Transp't Officers UK<br />

NUP NEAN Update Programme (EUROCONTROL)<br />

NUP north pole up (of a magnet)<br />

NVC National Vocational Qualification (UK)<br />

NVEE night vision enhancement equipment<br />

NVG night vision goggles<br />

NW <strong>navigation</strong>al warning (marine)<br />

NWP numerical weather prediction<br />

NWS National Weather Service (US)<br />

º degree (unit of angle = /180 rad<br />

O/B on board<br />

O/H overhead<br />

O&M operations <strong>and</strong> maintenance<br />

O&S operations <strong>and</strong> support<br />

OAB operational advisory broadcast<br />

99<br />

March 2012

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