NorthStar Navigation EXPLORER 657 Sonar fishfinding Introduction, Satellite window, Using

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7-1 Satellite window

The satellite window has information about the GPS satellites and GPS position.

To go to the satellite window, press			,
select More, then select Satellite.
The satellite window shows:

A
B
C					F
					G
					G

D

E

AStatus of GPS antenna, for example

Acquiring, GPS fix, No GPS. If the unit is in Simulate mode it displays Simulate (see section 2-6).

BTime and date from GPS satellites. Time is local time (UTC [GMT] plus local offset, see section 17-13)

CHDOP: The error in the GPS position caused by satellite geometry. A low value indicates a more precise fix, a high value a less precise fix

DSignal strengths of up to twelve visible GPS satellites. The higher the bar the stronger the signal

EBoat position

FPositions of visible GPS satellites:

Outer circle is horizon

Inner circle is 45° elevation

Center is directly above

North is at top of display

GIf the boat is moving, COG is a line from center

8 Sonar fishfinding: Introduction

Sonar functions require an optional sonar transducer to be installed and set up.

This section explains how to interpret the sonar displays, when and why to use the different frequencies and how fish are detected and displayed.

It also describes Gain and Range and shows examples of some of the different sonar displays.

8-1 Using the 657

The 657 uses a sonar transducer attached to the hull. The transducer generates an ultrasonic pulse (sound that is above the hearing range of the human ear), which travels down towards the bottom at a speed of about 4800 ft/sec (1463 m/sec), spreading out into a cone shape.

When the pulse meets an object, such as a fish or the bottom, it is partly reflected back up towards the boat as an echo. The depth of the object or bottom is calculated by the 657 by measuring

the time taken between sending a pulse and receiving the echo. When an echo has been returned, the next pulse is sent.

The 657 converts each echo into an electronic signal, displayed as a vertical line of pixels. The most recent echo appears on the extreme right of the display, with the older echoes being scrolled towards the left, eventually disappearing off the display.

Northstar Explorer 657 Installation and Operation Manual

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Contents Explorer Damage Possible injury or deathCould result in death or serious injury Could result in minor or moderate injuryPage Contents Tides window User card window 15 AIS Installation Other Nmea instruments Installation Northstar petrol/gasoline sensorsIntroduction 657 can use two kinds of plug-in card Cleaning and maintenanceOverview Plug-in cardsReplacing the display unit Changing the plug-in cardRemoving the display unit Turn the display unit off see -2 and put the dust cover onOverview of the keys Using the keysUsing the menus Basic OperationTurning off manually Turning on and off / auto power Turning on manuallyMan overboard MOB Backlight and night modeNight mode To cancel MOB or set another MOBSimulate mode Alarms657 has user settable alarms see section Main windows Page Multi window displays Deleting a favorite display from the list Favorite displaysSelecting a favorite display Adding a favorite display to the listDisplays can show data at the top, called the data header Setting the data header for a displayData header CompassNavigating to a point Navigation ChartGoing to a waypoint or to a point on the chart Introduction to navigatingStarting a route from the routes window Starting a route from the chart windowCancelling a route PreparingLand Sea Cursor see section Typical waypoint see section Chart windowTo go to the Chart window, press then select Chart Typical chart window showsLatitude and longitude Chart modesChart scale Chart symbols and informationProjected course Finding a chart symbolPerspective view Distance and bearing calculatorInterval Track Track 2, 3, 4 or Navigation Highway windowTracks and tracking Time intervals Interval Track Track 2, 3, 4 orWaypoints window Navigation WaypointsMoving a waypoint Displaying a waypoint on the chartManaging waypoints Creating a new waypointSort Waypoints Navigation RoutesDeleting all waypoints Changing a waypoint’s data Creating a new route Creating a new route from the chart window Routes window Managing routesCreating a new route from the routes window Displaying a route on the chartEditing a route from the chart Editing a routeSatellites Satellite window shows UsingSonar fishfinding Introduction Satellite windowStrength of echoes Interpreting the displayDepth Bottom typesFrequency and cone width WaterExample of shadows When to use 50 kHzWhen to use 200 kHz ShadowsWhen to use 50/200 kHz When to use MixedMinute ago Seconds ago Now KHz display 200/50 Khz display Mixed displayFish symbols Fish detection and display Where to find fishFish arches Zoom range and offset Range657 has two range modes AutoThis display is called the gain window Changing modeGain and threshold Gain windowSonar history display no split Sonar fishfinding DisplaysHistory position bar Extended history modeSonar Zoom and Full Screen Zoom displays Screen. Press to return to the most recent echoSonar 50/200 display Sonar Bottom displayBottom type Setting gain and thresholdSonar A-Scope display Fish recognitionChanging a gauge layout Gauges windowData window Selecting a Gauges layoutFuel window shows Fuel functions and displayWhat the fuel computer does Fuel windowWhen you add or remove fuel When you remove fuel Low fuel alarmBoat speed sensors Speed Log Economy Range Water speed and ground speedSpeed Log Economy Press twice, then select Fuel Fuel consumption curvesMaking a curve Start running the boat in a straight lineSelecting a curve Using a curveRenaming a curve Deleting a curveCalibration Setup enginesTo the reading of the fuel dispenser’s gauge Then press Tides window Choosing the date of the tide chartTides window shows data for the chosen date User card window has User card windowSaving data to the user card Rereading the file information 15 AISDeleting a file from the user card Sorting the file namesViewing AIS Vessels Displaying Full AIS Details Safety msgs rxAIS Windows VesselsDisplays Distress Poll 16 DSC/Buddy track windowsDeleting a boat Using the displays Displaying a boat on the chartBoat positions Creating a waypointSetting up SmartCraft Setup option menusTime see Favorites see 17-14 Simulate see Language Setup SystemAuto power off Factory resetPalette Setup ChartSetting map datum RotationMap shift Nmea datum offsetMap shift Applying a map shiftLat/lon grid Digit size Setup SonarPulse power FrequencyDgps Source Setup GPSSetup Fuel GPS SourceNum engines Setup enginesSetup tanks SourceRecord Setup TrackDistance TimeReset engine hours Setup AIS Show Dangerous OnlySetup Logs Reset total distAlarm sounds when it is on Setup AlarmsSymbol Alarm Arrival radius Anchor alarmFuel Setup UnitsTemperature Setup CommsSpeed filter Setup CalibrateTemperature filter SpeedSpeed range Setup TimeSetup Favorites Keel OffsetMode InstallationSetup Simulate SimulateGPS or Dgps antenna For GPS navigation see section Installation What comes withInstallation Options and Accessories Optional sensors and instrumentsDisplay unit 18-3 Black Yellow Blue Power/data cablePin Wire Function ConnectionsThere are two mounting arrangements Installation The display unitFlush Mounting Bracket MountingAuto power Installation Power/data cableBasic power Black Power/data cable Red Yellow Fuse 2AInstalling an antenna Installation GPS antenna Selecting an antennaDgps Source Installation Northstar petrol/gasoline sensors Installation Sonar transducerBlue Sonar cable Either Installation Other NavBus instruments Installation SmartCraftNavBus Installation Other Nmea instruments Installation Northstar VHF radioTilt and rotation for best viewing and hand Installation Setup and testEnter setup data to set up the 657 to your If the display unit is bracket mounted, adjustAppendix a Specifications Adindan Afgooye List of datumsSouth American General problems Appendix B TroubleshootingFuel consumption problems GPS navigation problemsThere is no reading for fuel economy Sonar fishfinding problemsTwin engine installation shows only one flow rate Erratic Fuel Flow readingsBottom is displayed too far up the screen Bottom is not displayedThere is a double bottom trace displayed Glossary Appendix C Glossary and navigation dataNavigation data TBMFT!COUNBSJOFDPN