Important The choice, location, angle and installation Sonar fishfinder: The accuracy of the sonar of the instrument & transducers are critical to depth display can be limited by many factors, performance of the system as intended. Follow including the type of the transducers, the location instructions in this manual carefully. If in doubt, of the transducers and water conditions. It is the consult your Northstar dealer. user’s responsibility to ensure the 657 transducers are installed and used

Revision A Part Number GM494 Northstar a unit of Brunswick New Technologies Marine Electronics 30 Sudbury Road Service: 978/897-6600 Acton, Massachusetts 01720 Sales: 800/628-4487 Contents 1 Welcome . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Welcome to the Northstar 491. . . . . . . . . . . . 2 Using this manual. . . . . . . . . . . . . . . . . . . . . . 2 Technical support. . . . . . . . . . . . . . . . . . . . . . 4 How echo sounding works. . . . . . . . . . . . .

The Northstar echo sounder system consists of: • the Northstar 491 echo sounder sensor • a Northstar navigation system such as the 962, 958 or 6000i • a transducer The 491 can be used with either a single-element transducer or a dual-element transducer. The 491 automatically pings both transmitters at power-up to determine the number of transducer elements connected. If a single element is detected, the 491 operates in single-frequency or dual-frequency interleaved mode (as determined by the ope

Obey all safety measures that follow this symbol to avoid possible injury or death. WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury. CAUTION indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury. CAUTION used without the safety alert symbol indicates a potentially hazardous situation which, if not avoided, may result in property damage. It is your sole responsibility to use the

It is used to alert you to potential personal injury hazards, Obey all safety messages that follow this symbol to avoid possible injury or death. WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury CAUTION indicates a potentially hazardous situation which, if not avoided, could result in minor or moderate injury. CAUTION used without the safety alert symbol indicates a potentially hazardous situation which, if not avoided, may result

LOW POWER (1 W) only. 2. Receive Only. 3. LOW POWER (1 W) initially. Override to HIGH POWER by holding down H/L key before transmitting. Used normally in bridge-to-bridge communications. 4. Lightly Shaded Simplex channels 03A, 21A, 23A, 61A, 64A, 81A, 82A, and 83A cannot be lawfully used in U.S. waters unless special authorization is obtained from the U.S. Coast Guard. Not for use by the general public. 5. The letter “A” illuminated by the channel number indicates the USA channel is simplex. Thi

4-6 DSC Functionality (DSC FUNC) DSC functionality can be disabled but this is not recommended. DSC SETUPDSC FUNC GROUP SETUP > ON INDIV REPLY OFF > DSC FUNC 1. Select DSC SETUP, then DSC FUNC. 2. The cursor is at ON. Press ENT or push the rotary knob to enable the DSC functionality and automatically disable ATIS functionality. The DSC annunciator appears on the screen. It’s not possible to have both ATIS ON and DSC ON simultaneously. When you enable one, the other will turn OFF. If DSC and ATIS

Zu jeder Zeit auf einen sicheren Bootsbetrieb achten. Eine bestmogliche Bauteilplatzierung und sorgfaltige Installation von Instrument und Geber sind Voraussetzung fur optimale Betriebsergebnisse. Die in diesem Handbuch enthaltenen Instruktionen sind genau zu befolgen. Im Zweifelsfall, einen Northstar Fachhandler konsultieren. Sicherstellen, dass durchzufuhrende Bohrungen und Ausschnitte nicht die Bootsstrukturen schwachen. Im Zweifelsfall, einen qualifizierten Bootsbauer konsultieren. Keine Kun

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1-1 Autopilot Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Using this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1-1-1 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1-1-2 Steering modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1-1-3 Power