A NAVIGATION MODULE FOR USE IN AN AUTONOMOUS UNDERWATER VEHICLE. THE MODULE PROVIDES VERY PRECISE NAVIGATION FOR THE AUV SYSTEM BY COMBINING GPS, ACOUSTIC AND DOPPLER VELOCITY LOG (DVL) AND INERTIAL NAVIGATION SYSTEM (INS). THESE SYSTEMS PROVIDE ACCURATE UNDERWATER NAVIGATION WITHOUT THE NEED FOR REFERENCE BUOYS THE SYSTEM IS HOUSED IN TWO MODULES WHICH ARE BOLTED TOGETHER INTERNALLY, ONE HAS THE DVL, THE OTHER HAS THE INS. THIS NAVIGATION MODULE CAN NOT BE USED ON ITS OWN AND MUST BE CONNECTED WITH OTHER MODULES TO FORM THE AU

THE VEHICLE INERTIAL SENSOR AND GPS SYSTEM HAS BEEN CLASSIFIED TO COMMODITY CODE 9014800000 IN ACCORDANCE WITH THE FOLLOWING: GENERAL INTERPRETIVE RULES (GIRS) GIR 1 HAS BEEN USED TO CLASSIFY THE PRODUCT BY THE TERMS OF HEADING 9014 DIRECTION FINDING COMPASSES; OTHER NAVIGATIONAL INSTRUMENTS AND APPLIANCES GIR 6 HAS BEEN USED TO CLASSIFY THE PRODUCT TO SUB HEADING LEVEL OTHER INSTRUMENTS AND APPLIANCES. ALSO CLASSIFIED IN ACCORDANCE WITH: HSENS CHAPTER NOTE 9014