... Software customization functionTour Commentaries GPS Tracking Audio-at-seat Day Tours Extended Tours Hop-on, Hop-off Bus, Tram, Train, Water-craft ... the tour commentaries. Tour commentaries GPS Tracking FM transmitter Day Tours Hop-On, Hop-Off Bus, Tram, Train, Water-craft and ... is impractical such as with hop-on, hop-off city tours or on water craft. Airline-style, multi-channel entertainment Audio ...