What does GBNA stand for?

Ground Based Navigation Aid (ground level signal tranmission and reception)

This definition appears very rarely and is found in the following Acronym Finder categories:

Military and Government
Science, medicine, engineering, etc.
Business, finance, etc.

Other Resources:

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Samples in periodicals archive:

A joint effort, meanwhile, between the mobility lab and Air Force Research Laboratory developed an autonomous approach and landing capability for huge C-17 transports in extreme weather without the benefit of ground based navigation aids.

Troops inspire array of innovative products