While the iGO 8 series is now considered a "legacy" product, it is still used by hobbyists for its low system requirements and highly customizable skinning engine. However, the developer (formerly Nav N Go) has since moved on to newer platforms:

Nav N Go Igo 834142975 boasts an impressive array of features that make it a top-notch navigation system. Some of its key features include:

is a family of in‑vehicle/offline GPS navigation software developed by NavNGo (now NNG). The string you provided ("nav n go igo 834142975") appears to be a product/identifier-like query; there’s no widely known product named exactly that, so below is a concise, useful summary about iGO navigation software and how to interpret/act on an identifier-like query.

Portable Navigators: Devices from brands like Mio, Navman, and various generic GPS units. Retrofitted PDAs: Older Windows Mobile handhelds.