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» Online Classroom   » Tech Support   » Inland & Coastal Navigation Course   » Luminous Range Diagram

Author Topic: Luminous Range Diagram
David Burch

 - posted March 20, 2004 12:12 PM      Profile for David Burch           Edit/Delete Post 
The Luminous Range Diagram in the recent printing of the notes is not very good. It does not show the nominal range scale beyond 8, and to make things worse it is a log scale, so after 8, the next vertical line is, 10, then 20, then 30, 40 etc. At one point we had a better example in our notes, but somehow it got switched to the one from the Coast Pilot. There are better ones in the Light List, such as the one below from the Canadian Light List.

Please print and use the one here for the related practice problems.

If this does not help, please post a specific question about it and we will go after that.

Luminous Range Diagram

The other thing i should mention in this regard is our short formula for predicting luminous range that you do with out this diagram. If you cannot find this in the course book, let me know and i will track it down.

it goes something like:

Luminous range = [(visibility/10) x nominal range ] + 1 nmi.

it is not precise to the tenth, but very close and generally more than adequate since we rarely know the visibilty very precisely...

Link to Canadian Light Lists is in our Inet Connections resources, under general navigation. They are very nice.

This relates to all problems in chapter 6. 6-x

From: Starpath, Seattle, WA

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