CHCNAV TX73 3D Excavator Technical Support Resources Choose from these “how to” videos with step by step instructions on the functionality available in CHCNAV TX73 software: 1.7 How to Customise your Display in CHCNAV TX73 1.5 How to Add & Configure Buckets in CHCNAV TX73 1.1 How to Create a Project & Set a Coordinate System in CHCNAV TX73 1.3 How to Bench & Adjust Datum in CHCNAV TX73 1.6 How to Cut to a Design in CHCNAV TX73 1.4 How to Import Designs in CHCNAV TX73 1.2 How to Connect a Base or Network in CHCNAV TX73