Wahoo ELEMNT? New, not cheap, reliability unknown because no established track record yet.

Bryton? Taiwanese. Not sure how much presence they have in N. America.

TomTom? Better known in Europe than N. America

Smartphone navigation app? On iPhone, Nokia Here Maps and Magic Earth are free, can work offline and have voice prompts. However, you will almost certainly need external battery packs as continued GPS use drains smartphone batteries pretty quickly. The UI may also take some figuring out.