Douglas Navigational Protractor 5" - D565

Marsoni

M251S

$15.00

Get it in 3 business days with 1 day shipping. Friday, May 29

Douglas Navigational Protractor 5" - D565Called "navigational" primarily because it goes continuously from 0 to 360 as a compass rose does. Use for plotting lines of position in celestial navigation or for general plotting and vector problems on plain paper that does not have a compass rose. In England and Australia it is more commonly called a Douglas Protractor, where they are popular for general plotting.

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Worth the investment especially if you have space for them and you have a big TV. I rock with a 75" in my living room. The box has a manual control module with buttons you can press, but this works with Alexa or Google Home via voice command. The Govee app unlocks way more settings and tuning, including what you see here. Super easy to set up the bars and link up everything. Easily worth the money. Brightness can be adjusted, lights are great, and color options (patterns, reactive, rotating, etc.) are fun. Cheers!

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Reviewed in the United States on November 29, 2025