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WASHINGTON, D.C. – The United States Air Force (USAF) and National Nuclear Security Administration (NNSA) completed the first development flight test of a non-nuclear B61-12 gravity bomb at Tonopah Test Range in Nevada on July 1, 2015.
The B61-12 LEP refurbishes both nuclear and non-nuclear components to extend the bomb’s service life while improving its safety, security and reliability. With the incorporation of an Air Force provided tail-kit assembly, the B61-12 will replace the existing B61-3, -4, -7, and -10 bombs.
There is no mention of GPS in the article.
Therefore an improvement in accuracy from 100-plus meter CEP (the current estimated accuracy of the B61) down to 30-plus meter CEP (assuming INS guidance for the B61-12)
Link to article