Buy from us: 1. These heavy duty vacuum suction hooks are the new version ones with a screw that will strongly lock the suction cup. some of the sellers may not have a Security screw lock. 2. They are protable and reusable.easy to remove, no tools required.The key thing is read and follow the instru...

Gordon West, WB6NOA, study manual for the 2012-2016 FCC Element 4 written examination for the Amateur Extra Class ham radio license. Book contains all 702 questions and answers, along with Gordo's educational, fun answer explanations. Fully-illustrated to aid learning. Q&A are reorganized into logic...

It’s time we cleared the air about ham radio. If you think of it as staticky transmissions sent by people in the middle of nowhere, think again. Today’s ham radio goes beyond wireless to extreme wireless, Operators transmit data and pictures, use the Internet, laser, and microwave transmitters, and...

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The American Practical Navigator, first published in 1802, was billed as the “epitome of navigation” by its original author, Nathaniel Bowditch, an early American mathematician who is often considered the founder of modern maritime navigation. The text, often colloquially referred to simply as “Bowd...