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The park’s owner is planning to expand the campground, but archivists and Vince Tacan, chief of the Sioux Valley Dakota Nation, oppose it.

Last week the House Commerce Committee, after reviewing the controversy and the still-secret development of Tacan, turned up a shocking note: since 1948 the Navy and Air Force have spent $176 million to develop Tacan, but they candidly admit that it is still full of bugs.

Omni-DME is slightly more accurate for distance; Tacan is slightly better on direction.

By 1952 word leaked�out that the Navy-inspired Tacan would make Omni-DME obsolete.

The Air Force, which found the Navy system less sensitive to rough terrain than Omni-DME, backed Tacan.