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Your cart is empty.The 24 Inch Parallel Rule is primarily used for commercial purposes due to its extra long 24 inch acrylic construction, rigid chrome arms and handles. Parallel rulers are used to plot direction on nautical charts. Two straightedges are hinged so that they maintain the same angle. By alternating the moving edge, and securely holding down the non moving edge, you can move the rulers about the chart while still maintaining the same angle.
T057
2025-09-05 15:19:48
When you are taking ASA 105/205 you really can't make any errors greater than 2-3 degrees. When you are using the big 1210TR chart, these are a big help and greatly increased my accuracy, which allowed me to pass ASA 205.
Scott A. Beers
2025-08-19 16:22:19
While it won't be used too often...the oversized parallel rules are a nice addition to the tool bag. Weems & Plath makes a great product.
Dale H.
2025-07-30 16:43:19
If you are studying for your OUPV License like I was, this is a must for your charting problems. I suggest that you add this to your plotting equipment as it makes plotting longer distances much easier and with less movements of the parallel ruler. The 12" parallel ruler that most courses provide is just too short. This item is of great quality, but does take more effort to prevent movement while walking the ruler to different areas of your chart.
Customer
2025-05-31 10:33:37
Great
Steve Anderson
2025-05-03 13:31:13
This 24" is the perfect size for working with the larger folding charts. Improved accuracy over the smaller model. Save those for a chart kit book.
TV Guy
2025-05-01 18:44:20
I am taking a boat crew course in the USGCAUX and some of the charts they want me to work on are too large for the smaller parallel rulers. This makes my job much easier.
Robert S. Koprowski
2025-04-10 12:30:19
I ordered this tool because I needed them in order to pass the US Coast Guard test to become a Licensed Captain. The Parallel rules arrived and were bent, bent enough that it could not be used to accurately plot Lattitude/Longitude or fixes on a chart. I had to use a shorter set that I purchased at a local marine supply store and luckily I was able to pass the test. I was very disappointed (and angry at first) that I could not use the rules and could possibly fail the test because of it. I chose not to return the item after the test as it will rarely be used.I wasn't particularly pleased with Customer Service's response either, as they showed little sense of urgency to get these replaced ASAP.
Customer
2025-03-30 09:13:19
Worked like it should
Jonathan norman
2025-03-15 15:05:25
Big
Customer
2025-02-10 18:29:42
Very good quality accurate.. the rubber gives good grip but some times slipper when movingBut over all very best
Gautam Gupta
2025-02-07 13:17:05
This is a standard high quality product but it arrived with a a curve so when you glide it across the chart and wish to draw a straight long line, you might get an error of upto 2 degree high or low. I recommend buying a 20 inch.
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