Weems & Plath Marine Navigation Parallel Ruler (Aluminum Arms, 15-Inch)

Excellent set! Having the slightly larger parallels is well worth it. Replaced my 12” with this 15” and will never look back. Excellent quality, easy to use and durable.

Perfect. Easy to read, nice and smooth. Used it for sailing classes and worked perfectly. Only thing I would caution buyers about be careful of the size, I like the larger size but some chart books are smaller and it doesn’t fit easily.

Good quality!!!

This is the original way of reading chart headings in the nautical world. It's neat that they are clear as it makes it easy to see what you are doing when aligning them. My older set were not.

the parallel rules are extremely useful for me when plotting and charting positions as well as determining bearings. We keep a DR track of our voyages and it was so much more difficult prior to getting the rule. I would however have liked a ruler on at least one edge so that I could also use it to measure distances. Even a pencil will not make a temporary mark on the rule necessitating me to use another tool to measure distances.

Well made. Now I can plan all kinds of voyages on my dining room table. Helpful in plotting offshore race courses.

Very easy to use and accuracy.

Great for plotting and large enough to move to and from Compass rose