NAVTEC is like the Walmart of adventure tours - you can find anything you might want but the quality may not be great. Your money and time may be worth looking for a high-quality vendor. While our tour guide was fabulous, the vehicle experienced difficulties numerous times during our tour, stalling in precarious locations (in pretty remote locations on twisty, rocky paths) so we all decided to turn back to town early.
(These trucks are old and really take a beating going on these trips.). Our guide was very frustrated for us and cared that he couldn't show us more but when we returned to the shop but, the management and customer service staff didn't seem to care at all and only provided a small credit. (The owner was out back and didn't bother to come in to apologize. No apology was given by the customer service staff either.)