NorthStar Navigation EXPLORER 657 Setup Calibrate, Speed filter, Temperature filter

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17-12 Setup > Calibrate

Press	twice, then select Calibrate:

Speed

This calibrates the speed from a paddlewheel sensor connected to the 657. Calibration may be required because different hull shapes have different flow characteristics. Obtain an accurate measurement of the boat’s speed from a GPS receiver; or by following another boat travelling at a known speed; or by making a timed run over a known distance.

Note: for accurate calibration:

•The speed from a GPS receiver should be greater than 5 knots.

•The speed from another paddlewheel transducer should be between 5 and 20 knots.

•Best results are achieved in calm conditions where there is minimal current (best at high or low tide).

Calibrating speed:

1Travel at a constant, known speed.

2 In the Calibrate menu, select Speed.

3Press or to change the displayed speed to the true value.

4Press .

Speed filter

Waves and wind cause the boat speed from the paddlewheel transducer to fluctuate slightly. To give stable readings, the 657 calculates these values by taking several measurements and averaging them. Set the Speed filter to the lowest value which gives stable readings. The range is 1 to 30 seconds or Off (0).

Temperature

The factory settings should be sufficiently accurate for normal usage. To calibrate the temperature readout, first measure the water temperature with a thermometer known to be accurate.

Use the cursor keys to display the temperature readout box, then increase or decrease the value to match the measured temperature. The temperature can be set from 32° to 99.9°F (0° to 37.7°C) with a resolution of 0.1° unit.

To change the units between °F (Fahrenheit) or °C (Celsius). (see section 17-10).

Temperature filter

Water turbulence and currents cause the water temperature to fluctuate slightly. To give stable readings, the 657 calculates these values by taking several measurements and averaging them. Set the Temperature filter to the lowest value which gives stable readings. The range is 1 to 30 seconds or Off (0).

72	Northstar Explorer 657 Installation and Operation Manual

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Contents Explorer Possible injury or death Could result in death or serious injuryCould result in minor or moderate injury DamagePage Contents Tides window User card window 15 AIS Installation Northstar petrol/gasoline sensors Installation Other Nmea instrumentsIntroduction Cleaning and maintenance OverviewPlug-in cards 657 can use two kinds of plug-in cardChanging the plug-in card Removing the display unitTurn the display unit off see -2 and put the dust cover on Replacing the display unitUsing the keys Using the menusBasic Operation Overview of the keysTurning on and off / auto power Turning on manually Turning off manuallyBacklight and night mode Night modeTo cancel MOB or set another MOB Man overboard MOBAlarms Simulate mode657 has user settable alarms see section Main windows Page Multi window displays Favorite displays Selecting a favorite displayAdding a favorite display to the list Deleting a favorite display from the listSetting the data header for a display Data headerCompass Displays can show data at the top, called the data headerNavigation Chart Going to a waypoint or to a point on the chartIntroduction to navigating Navigating to a pointStarting a route from the chart window Cancelling a routePreparing Starting a route from the routes windowChart window To go to the Chart window, press then select ChartTypical chart window shows Land Sea Cursor see section Typical waypoint see sectionChart modes Chart scaleChart symbols and information Latitude and longitudeFinding a chart symbol Perspective viewDistance and bearing calculator Projected courseNavigation Highway window Tracks and trackingTime intervals Interval Track Track 2, 3, 4 or Interval Track Track 2, 3, 4 orNavigation Waypoints Waypoints windowDisplaying a waypoint on the chart Managing waypointsCreating a new waypoint Moving a waypointNavigation Routes Deleting all waypointsChanging a waypoint’s data Sort WaypointsCreating a new route from the chart window Routes windowManaging routes Creating a new routeDisplaying a route on the chart Editing a route from the chartEditing a route Creating a new route from the routes windowSatellites Using Sonar fishfinding IntroductionSatellite window Satellite window showsInterpreting the display Strength of echoesBottom types Frequency and cone widthWater DepthWhen to use 50 kHz When to use 200 kHzShadows Example of shadowsWhen to use Mixed When to use 50/200 kHzKHz display 200/50 Khz display Mixed display Minute ago Seconds ago NowFish detection and display Where to find fish Fish symbolsFish arches Range 657 has two range modesAuto Zoom range and offsetChanging mode Gain and thresholdGain window This display is called the gain windowSonar fishfinding Displays Sonar history display no splitExtended history mode Sonar Zoom and Full Screen Zoom displaysScreen. Press to return to the most recent echo History position barSonar Bottom display Sonar 50/200 displaySetting gain and threshold Sonar A-Scope displayFish recognition Bottom typeGauges window Data windowSelecting a Gauges layout Changing a gauge layoutFuel functions and display What the fuel computer doesFuel window Fuel window showsWhen you add or remove fuel Low fuel alarm When you remove fuelBoat speed sensors Water speed and ground speed Speed Log Economy RangeSpeed Log Economy Fuel consumption curves Making a curveStart running the boat in a straight line Press twice, then select FuelUsing a curve Renaming a curveDeleting a curve Selecting a curveSetup engines CalibrationTo the reading of the fuel dispenser’s gauge Then press Choosing the date of the tide chart Tides windowTides window shows data for the chosen date User card window User card window hasSaving data to the user card 15 AIS Deleting a file from the user cardSorting the file names Rereading the file informationViewing AIS Vessels Safety msgs rx AIS WindowsVessels Displaying Full AIS Details16 DSC/Buddy track windows Displays Distress PollUsing the displays Displaying a boat on the chart Boat positionsCreating a waypoint Deleting a boatSetting up Setup option menus SmartCraftTime see Favorites see 17-14 Simulate see Setup System Auto power offFactory reset LanguageSetup Chart Setting map datumRotation PaletteNmea datum offset Map shiftApplying a map shift Map shiftLat/lon grid Setup Sonar Pulse powerFrequency Digit sizeSetup GPS Setup FuelGPS Source Dgps SourceSetup engines Setup tanksSource Num enginesSetup Track DistanceTime Record Setup AIS Show Dangerous Only Setup Logs Reset total dist Reset engine hoursSetup Alarms Symbol AlarmArrival radius Anchor alarm Alarm sounds when it is onSetup Units TemperatureSetup Comms FuelSetup Calibrate Temperature filterSpeed Speed filterSetup Time Setup FavoritesKeel Offset Speed rangeInstallation Setup SimulateSimulate ModeInstallation What comes with Installation Options and AccessoriesOptional sensors and instruments GPS or Dgps antenna For GPS navigation see sectionPower/data cable Pin Wire FunctionConnections Display unit 18-3 Black Yellow BlueInstallation The display unit Flush MountingBracket Mounting There are two mounting arrangementsInstallation Power/data cable Basic powerBlack Power/data cable Red Yellow Fuse 2A Auto powerInstallation GPS antenna Selecting an antenna Installing an antennaDgps Source Installation Sonar transducer Installation Northstar petrol/gasoline sensorsBlue Sonar cable Either Installation SmartCraft Installation Other NavBus instrumentsNavBus Installation Northstar VHF radio Installation Other Nmea instrumentsInstallation Setup and test Enter setup data to set up the 657 to yourIf the display unit is bracket mounted, adjust Tilt and rotation for best viewing and handAppendix a Specifications List of datums Adindan AfgooyeSouth American Appendix B Troubleshooting General problemsGPS navigation problems Fuel consumption problemsSonar fishfinding problems Twin engine installation shows only one flow rateErratic Fuel Flow readings There is no reading for fuel economyBottom is not displayed Bottom is displayed too far up the screenThere is a double bottom trace displayed Appendix C Glossary and navigation data GlossaryNavigation data TBMFT!COUNBSJOFDPN