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 #2 (permalink) Fri Aug 08, 2008 20:29 pm Sentence: The role and importance of aeronautical information/data changed... |
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These things caused a significant change in the role and importance of aeronautical informatin/date:
- The implementation of area navigation
- The level of navigation performance that was requried
- Airborn computer-based navigation
Does that help? |
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Barb_D
I'm here quite often ;-)
Joined: 13 Jun 2008
Posts: 474
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| #3 (permalink) Fri Aug 08, 2008 23:38 pm Sentence: The role and importance of aeronautical information/data changed... |
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Hi !!
"Required" doesn't need a subject because it is an adjective.
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On earth there is nothing great but man, in man there is nothing great but mind. |
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 Sophie
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Joined: 26 Mar 2008
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Location: Vietnam
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| #4 (permalink) Tue Aug 12, 2008 19:37 pm Sentence: The role and importance of aeronautical information/data changed... |
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| liqichao wrote: |
hello everyone,
I am confused with the tense in this sentence because whole artical use present but just in this sentence use past tense. besides, I do not know which word is the subject of 'required'? and how should I understand the 'significantly', dose it mean dramatically and data changes with implementation closely ?
:D |
The past tense indicates that the role and importance of the data had already changed when the article was written. Significantly means "a lot". The sentence suggested big changes but did not how much or in what way. It is trying to say that, before, pilots navigated from waypoint to waypoint with the aid of radio navigation (like VOR and DME) so if the waypoint is printed wrong on a paper chart, it wasn't as important as it is now, with (the implementation of ) area navigation where the computer performs the navigation. The data the computer has have to be accurate. Hope this helps...
"Required Navigation Performance" is a technical term, commonly referred to as RNP. It specifies how accurate your equipment has to be to be operating in a particular area navigation (RNAV) operation. |
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Diverhank
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Location: California, USA
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| Usage of encompass, contain, involve | difference between meet, 'meet with' and 'meet up with' |
