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products   companies   categories Navigation equipment Integrated bridge systems (5) Compasses (7) Magnetic compass accessories (1) Ships' inertial navigation systems (1) Electronic navigation aids (12) Navigation instruments (8) Navigation radar (12) Collision avoidance equipment (1) Viewing and vision enhancing equipment (5) Chronometers and watches (3) Loose chart room equipment (2) Charts (7) Books and information for navigation (4) Pre-printed forms and logs (0) Navigation software (3) Radar reflectors (2) Autopilots and dynamic positioning (10) Docking systems (0) products   companies   categories Electronic navigation aids Loran navigation (0) Radio direction finding (1) Hand-held GPS (1) Fixed GPS (1) DGPS (2) Plotters (0) Decca navigators (0) Omega navigators (0) Echo sounders with plotters (0) Automatic chart plotters (1) Astro navigation calculators (0) Fish finders (1) Doppler velocity log (1) products   companies   categories Doppler velocity log Teledyne R. D. Instruments Europe Navigator Doppler Velocity Log (DVL)   Teledyne RD Instruments ' navigation systems referred to as DVL(Doppler Velocity Log)use the Doppler effect to measure the speed over bottom and to assist the navigation of underwater vehicles,surface vessels,diver platforms . The TRDI DVL provide precise velocity,low altitude bottom tracking,altitude updates and optionally current profile data for any underwater task.