roller plotter or parallel rulers? - Page 2 - SailNet Community
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post #11 of 26 Old 09-22-2012
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Re: roller plotter or parallel rulers?

Portland plotter


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post #12 of 26 Old 09-22-2012
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Re: roller plotter or parallel rulers?

I use two triangles but my fav tool is simply a see through protractor that is big. One can line it up with north and measure angles fairly well. Measure the bearing to your "aid to nav" and then put that angle on the icon on your chart. You are then along a line passing thru the center of the protractor (after correcting for local variation). Do it again for a 2nd aid and the intersection is your position. My fav compass is a simple Silva compass with a fold-up mirror. It is light, easy to use and for me, intuitive.
A large right triangle of clear plastic is truly valueable to go from Lat and Lon alomng the chart sides to your place on the chart.
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post #13 of 26 Old 09-22-2012
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Re: roller plotter or parallel rulers?

A roller plotter and a long straight edge works well.
I have a big chart table, however.
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post #14 of 26 Old 09-22-2012
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Re: roller plotter or parallel rulers?

I have both and use neither very often, To the folks at OpenCPN thank you.

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post #15 of 26 Old 09-26-2012 Thread Starter
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Re: roller plotter or parallel rulers?

well, still learning, but now having done some plotting at sea, parallel rulers are theoretically the most intuitive, and work great in a classroom but when the boat is on its ear are not so friendly.
portland plotter is the winner so far, but i have to do some real self study at home to find out if there is anything they dont do. i havent tried the two triangles or the roller plotter yet. Oh, and for the boats i have been using, sailboats 40' and under, the smaller tools fit the nav table better.

i guess it's time to take a coastal nav course.

my bet is that the portland plotter is going to hold it own pretty well.

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post #16 of 26 Old 09-26-2012
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Re: roller plotter or parallel rulers?

Two triangles --- K.I.S.S.

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post #17 of 26 Old 09-26-2012
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Re: roller plotter or parallel rulers?

I find the Davis One Arm Protractor easiest to use-- particularly, when at the helm I'm working with a chartbook in my lap. Parallel rulers, roller plotter, and a pair of triangles all require a flat surface.
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post #18 of 26 Old 09-26-2012
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Re: roller plotter or parallel rulers?

Quote:
Originally Posted by Hudsonian View Post
I find the Davis One Arm Protractor easiest to use-- particularly, when at the helm I'm working with a chartbook in my lap. Parallel rulers, roller plotter, and a pair of triangles all require a flat surface.
and ideally charts without any creases or folds.

I have a Davis plotter as well. I like the sturdy construction of the Portland plotter and the ability of account for variation. I have some instructions that show how to account for deviation as well, but since none of the boats I sail have deviation cards, I have not tried out that feature.

The parallel rule is nice for doing a faster advanced LOP. But I am almost as fast with the Portland.

My next best "plotter" is the Douglas protractor. Not mentioned yet.


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post #19 of 26 Old 10-19-2012
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Re: roller plotter or parallel rulers?

The problem with both rolling plotters and parallel rules is that in a moving boat, they tend to slide. A minor slide and you screw up your plotting. My solution (not patented yet) is to use a rolling plotter, I use an inexpensive Weems & Plath. They have two small grooves between the rollers. Go to Home Depot, and buy the smallest o ring that will fit snuggle in those grooves. Now you have a roller that stick to the chart. Good luck
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post #20 of 26 Old 10-29-2012
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Re: roller plotter or parallel rulers?

I use a Portland Plotter which I personally think are most suitable for smaller boats.

Pete

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