Garmin GPSMAP 8000 Glass Helm Series Instruction Manual

Contents

Appearance: Configures the appearance of the sonar screen(Sonar Appearance Settings).Alarms: Sets sonar alarms (Sonar Alarm Settings).Advanced: Configures various sonar display and data sourcesettings (Advanced Sonar Settings).Installation: Configures the transducer (Transducer InstallationSettings).Sonar Noise Rejection SettingsFrom a sonar view, select Menu > Sonar Menu > Sonar Setup> Noise Reject.Interference: Adjusts the sensitivity to reduce the effects ofinterference from nearby sources of noise.The lowest interference setting that achieves the desiredimprovement should be used to remove interference from thescreen. Correcting installation issues that cause noise is thebest way to eliminate interference.Color Limit: Hides part of the color palette to help eliminatefields of weak clutter.By setting the color limit to the color of the undesired returns,you can eliminate the display of undesired returns on thescreen.Smoothing: Removes noise that is not part of a normal sonarreturn, and adjusts the appearance of returns, such as thebottom.When smoothing is set to high, more of the low-level noiseremains than when using the interference control, but thenoise is more subdued because of averaging. Smoothingcan remove speckle from the bottom. Smoothing andinterference work well together to eliminate low-level noise.You can adjust the interference and smoothing settingsincrementally to remove undesirable noise from the display.Surface Noise: Hides surface noise to help reduce clutter.Wider beam widths (lower frequencies) can show moretargets, but can generate more surface noise.TVG: Adjusts the time varying gain, which can reduce noise.This control is best used for situations when you want tocontrol and suppress clutter or noise near the water surface.It also allows for the display of targets near the surface thatare otherwise hidden or masked by surface noise.Sonar Appearance SettingsFrom a sonar view, select Menu > Sonar Menu > Sonar Setup> Appearance.Color: Sets the color scheme and color gain.Overlay Data: Sets the data shown on the sonar screen.A-Scope: Displays a vertical flasher along the right side of thescreen that shows instantaneously the range to targets alonga scale.Depth Line: Shows a quick-reference depth line.Edge: Highlights the strongest signal from the bottom to helpdefine the hardness or softness of the signal.Pic. Advance: Allows the sonar picture to advance faster bydrawing more than one column of data on the screen foreach column of sounder data received. This is especiallyhelpful when you are using the sounder in deep water,because the sonar signal takes longer to travel to the waterbottom and back to the transducer.The 1/1 setting draws one column of information on thescreen per sounder return. The 2/1 setting draws twocolumns of information on the screen per sounder return,and so on for the 4/1 and 8/1 settings.Range Lines: Shows the vertical lines indicating the distance tothe right and left of the boat. Available for SideVü sonar view.Sonar Alarm SettingsNOTE: Some settings require external accessories.Select Settings > Alarms > Sonar.Shallow Water: Sets an alarm to sound when the depth is lessthan the specified value.Deep Water: Sets an alarm to sound when the depth is greaterthan the specified value.Water Temp.: Sets an alarm to sound when the transducerreports a temperature that is 2°F (1.1°C) above or below thespecified temperature.Contour: Sets an alarm to sound when the transducer detects asuspended target within the specified depth from the surfaceof the water and from the bottom.Fish Alarm: Sets an alarm to sound when the transducerdetects a suspended target within the specified depth rangeand the specified color range.Advanced Sonar SettingsFrom a sonar view, select Menu > Sonar Menu > Sonar Setup> Advanced.Transmit: Stops the transducer from transmitting.Shift: Allows you to set the depth range on which the sonar isfocused. This allows you to zoom in a higher resolution in thefocused depth.When using shift, bottom tracking may not work effectively,because the sonar looks for data within the depth range ofthe focused area, which may not include the bottom. Usingshift also can impact the scroll speed, because data outsidethe depth range of the focused area is not processed, whichreduces the time required to receive and display the data.You can zoom in to the focused area, which enables you toevaluate target returns more closely at a higher resolutionthan just zooming alone.Echo Stretch: Adjusts the size of the echoes on the screen tomake it easier to see separate returns on the screen.When targets are difficult to see, echo stretch makes thetarget returns more pronounced and easier to see on thescreen. If the echo stretch value is too high, the targets blendtogether, and if the value is too low, the targets might besmall and difficult to see.You can use echo stretch and filter width together to obtainthe preferable resolution and noise reduction. With echostretch and filter width set to low, the display has the highestresolution, but is the most susceptible to noise. With echostretch set to high and filter width set to low, the display hasa lower resolution, but has wider targets. With echo stretchand filter width set to high, the display has the lowestresolution, but is the least susceptible to noise. It is notrecommended to set echo stretch to low and filter width tohigh.Bottom Track: Sets the frequency used for determining depth.The bottom tracking control allows you to select the specificchannel that is used to track the bottom. For example, youcan set the bottom tracking for the low frequency for deepwater operation.Temp. Source: Sets the channel for the water temperature logwhen more than one water-temperature sensor ortemperature-capable transducer is connected.Transducer Installation SettingsFrom a sonar view, select Menu > Sonar Menu > Sonar Setup> Installation.Transmit Rate: Sets the length of time between sonar pings.Increasing the transmit rate increases the scroll speed, but itmay also increase self-interference.Sonar 15