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PARALLEL INDEXING TECHNIQUES

Parallel Indexing Techniques

 
 Author(s)                

I. Smith, R. A. Mulroney
 Publisher Warsash Publishing
 Date 1979
 Pages 48
 Format pdf
 Size 1 Mb


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   The authors have decided against updating its contents since the fundamental theoretical principles of Parallel Indexing don't change with time. Nowadays, many marine  navigators are still not using Parallel Indexing to monitor their vessel's progress and their vessel goes aground simply because the bridge team doesn't know the exact position of the ship at all stages of the navigational passages. And the vast majority of the modern rasterscan radar/ARPA displays have electronic parallel indexing lines available for use, similar to the type described in Annex 3. Unfortunately we have already had GPS assisted groundings due to inability of the navigators to correct the GPS displayed position using the datum corrections required before plotting the corrected position on the chart A. Jet fighter pilot recently said that the major problem with GPS is that I know where my aircraft is, but where is the position of the airfield? Thus Parallel Indexing used in conjunction with keeping a good visual lookout and various electronic navigational aids that are readily available, will continue for future years to provide the prudent navigator with that critically important piece of practical navigational information, the position of the vessel now.

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