Wide Area Augmentation System

Rarity: Common

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What Wikipedia says

The Wide Area Augmentation System (WAAS) is an air navigation aid developed by the Federal Aviation Administration to augment the Global Positioning System (GPS), with the goal of improving its accuracy, integrity, and availability.

Excerpt from the Wikipedia article “Wide Area Augmentation System”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: FAA, vectorized by FranklyMyDear..., Public domain, via Wikimedia Commons.