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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

MULTIBEAM ECHOSOUNDER USED DURING SEABED EXCAVATION OPERATIONS TO ENSURE CORRECT DEPTH AND PROFILE IS CORRECT

ECHO SOUNDER. A GENERAL PURPOSE ECHO SOUNDING SET FOR SHALLOW AND DEEP WATER. DEPENDENT UPON SUBMARINE OR SURFACE AND THE VARIENT IT MAY INCORPORATE THE FOLLOWING MAJOR COMPONENTS: RECORDER DIGITISER TRANSDUCER CABLE & SWITCH BOXES REMOTE DIGITISER UNIT DEPTH COMENSATOR UNIT INCORPORATES FACILITIES FOR THE USE OF A DIGITISER, WHICH PROVIDES A DIGITAL DEPTH READOUT AND ALSO COVERTS EXHO SIGNALS INTO BINARY FORMAT FOR USE IN A COMPUTER AND DATA LOGGER SYSTEM.

ECHO SOUNDER. A GENERAL PURPOSE ECHO SOUNDING SET FOR SHALLOW AND DEEP WATER. A GENERAL SERVICE DEPTH RECORDER (GSDR), WHICH IS A NAVIGATIONAL UNIT USED FOR SOUNDINGS. INCORPORATES A BRIDGE UNIT (BU), WHICH IS AN AID TO PILOTAGE AND OPRATES WITHN THE DEPTH RANGE OF 2-99 METRES. MAY BE INSTALLED IN THE BRIDGE AREA OR IN THE CONTROL ROOM. THE MAIN UNITS THAT COMPRISE THE ECHO SOUNDER ARE: GENERAL SERVICE DEPTH RECORDER. RECEIVER/TRANSMITTER. DISPLAY UNIT (BRIDGE UNIT). MEDIUM DEEP TRANSDUCER. SHALLOW TRANSDUCER(S). FITTED TO ALL SURFACE SHIPS, SUBMARINES AND SURVEY SHIPS.

AN UNDERWATER COMMUNICATION SYSTEM UTILISING SONAR AS THE CARRIER MEDIUM. PROVIDES SIMPLES COMMUNICATIONS BETWEEN THE VESSELS BY THREE DIFFERENT MEANS: SONAR SIGNALS. SLOW SPEED TELEGRAPHY (SST) BY MORSE KEY. SPEECH. IT OPERATES ON A STANDARD SONAR CARRIER FREQUENCY; THE DATA TO BE TRANSMITTED MODULATES THE UPPER SIDEBAND WITH THE CARRIER BEING SUPPRESSED. IT IS COMPATIBLE WITH ALL UNDERWATER TELEPHONES. IT HAS BEEN DESIGNED TO BE USED WITH VARYING COMPLEXITY DEPENDING ON THE TYPE OF VESSEL. THE TRANSDUCERS ARE ARRANGED IN ARRAYS OR USED SINGLY: -NAROW BAND SERVO CONTROLLED TRAINED ARRAY. - OMNI DIRECTIONAL FIXED ARRAY. - SINGLE BROADBAND TRANSDUCER. USERS CONTROLS ARE GROUPED ON THE ACOUSTIC LINK CONTROL UNIT (ACLU) AND THE TRAINING CONTROL UNIT (TCU), WHICH ARE LOCATED IN THE CONTROL ROOM ON SUBMARINES.