How to fix depth indication not appearing on Furuno GP-1971F Plotter?
- LLarry PorterSep 8, 2025
To resolve the issue of the depth indication not appearing on the screen of your Furuno Plotter, adjust the bottom level HF/LF.

How to fix depth indication not appearing on Furuno GP-1971F Plotter?
To resolve the issue of the depth indication not appearing on the screen of your Furuno Plotter, adjust the bottom level HF/LF.
What to do if the touch screen on my Furuno GP-1971F is not responding?
If the touch screen on your Furuno Plotter isn't responding, try these steps:1. Press the power key and check that [Touch Screen] in the [Brilliance] pop-up menu is set to [ON].2. Turn the power off, then on again.If the problem persists, contact your local dealer for service.
What to do if Furuno GP-1971F power is on, but nothing appears on the screen?
If the power is on but nothing appears on the screen of your Furuno Plotter, try the following:* Press the power button several times to adjust the brilliance.* Check if the unit is plugged into the power source.
Why is the picture on my Furuno GP-1971F not updated or freezing?
If the picture on your Furuno Plotter is not updated or freezes, check for obstructions between the antenna and the display unit. If the picture has frozen, turn the power off and on again.
Why do marks and characters appear, but no picture appears on my Furuno GP-1971F?
If marks and characters appear on your fish finder display but no picture appears on your Furuno Plotter, check if the transducer cable is tightly connected.
Why does the picture appear but the zero line does not appear on my Furuno GP-1971F Plotter?
If the picture appears but the zero line does not appear on your Furuno Plotter, the picture may be shifted. Check the shift setting. Also, check if the draft setting ([Settings] => [Fish Finder] => [Sensor Setup]) is zero or higher.
How to plot own ship track on Furuno GP-1971F?
If the own ship track is not plotted on your Furuno Plotter, check if [Tracks Disp] is turned on in the layered menu.
Why is the position not fixed on my Furuno GP-1971F Plotter?
Check for interfering objects near the Furuno Plotter display unit that might be blocking reception, if position is not fixed.
Why does Furuno GP-1971F go into stand-by after tapping the [TX] icon?
If you tapped the [TX] icon to transmit and the "TX screen" appears momentarily, but the radar soon goes into stand-by on your Furuno Plotter, the overload protection has activated. To restore normal operation, turn off all equipment in the network, wait a few seconds, then turn on all the equipment.
How to fix poor discrimination in range on Furuno GP-1971F Plotter?
To address poor discrimination in range on your Furuno Plotter, adjust the rain control.
| Display Type | TFT LCD |
|---|---|
| Resolution | 800 x 480 pixels |
| Sonar Capability | Yes |
| Fish Finder | Yes |
| Frequency | 50/200 kHz |
| Chartplotter | Yes |
| Chart Compatibility | C-MAP, Navionics |
| Power Output | 600 W |
| Interface | NMEA 0183, NMEA 2000 |
| GPS Receiver | Built-in GPS |
Procedure for powering the system on and off.
How to adjust screen brightness and color palettes.
Prevents accidental operation by locking screen icons and buttons.
How to select and customize the main display pages.
Modifying and removing customized pages from the Home screen.
Switching between active screens in divided display layouts.
Explanation of the four types of menus: slide-out, layered, pop up, and settings.
Accessing screen-specific functions from the right edge.
Adjusting display settings for icons and indications from the bottom.
Context-based menus for tapped items or screens.
Accessing customizing options for the equipment.
Configuring and displaying navigational data in customizable boxes.
Enabling or disabling beeps during the power-off countdown.
Setting up two-finger tap gestures for quick operations.
Marking a man overboard position and creating a route to it.
Removing an active Man Overboard mark from the display.
Connecting to a wireless network for updates and information.
Familiarizing with system operations using simulated data.
Introduction to the plotter screen layout and components.
Choosing between Vector, Shaded Relief, Satellite, and Raster chart types.
Adjusting the zoom level of the chart display using slider or pinch.
Setting chart orientation to North Up, Head Up, or Course Up.
Panning the chart display to view different areas.
Configuring how the vessel's icon is displayed on the chart.
Adjusting the display of the Course Over Ground vector.
Toggling the visibility of the heading line on the chart.
Selecting from four types of icons for the own ship.
Adjusting the default "center" position of the own ship icon.
Resetting [Ship and Tracks] menu settings to factory defaults.
Displaying information for the cursor location on the chart.
Measuring bearing, range, and trip time between two points.
Viewing charts in 2D or 3D perspective.
Viewing detailed information from C-MAP chart cards.
Displaying radar echo images overlaid on the plotter.
Operating the NAVpilot autopilot from the plotter.
Setting the autopilot as a navigation method.
Displaying weather forecast information overlaid on the plotter.
Displaying tide station information in graph format.
Viewing tidal current data from chart cards or C-Weather overlay.
Checking the signal strength and availability of GPS satellites.
Understanding how the boat's track is plotted on the display.
Toggling the visibility of current and past tracks.
Enabling or disabling the recording of the boat's track.
Configuring track recording interval, color, and thickness.
Methods for deleting individual, sectional, or all recorded tracks.
Removing a single recorded track from the system.
Deleting specific segments of a recorded track.
Enabling auto-delete for oldest tracks when memory is full.
Removing all recorded tracks from the system.
Understanding points, reference points, and event marks.
Setting color, shape, and size for points and event marks.
Creating new points or event marks on the display.
Viewing and managing the list of created points and event marks.
Finding specific points by name in the points list.
Arranging the points list by name, date, or distance.
Hiding points based on color, symbol, or a combination.
Relocating a point on the screen or via the points list.
Removing individual points or all points from the system.
Changing a point's location, name, description, color, or symbol.
Editing point details, setting destinations, locating on map, or adding to routes.
Toggling the visibility of all points on the chart.
Explains what a polyline is and its common uses.
Creating a polyline by connecting multiple points (vertices).
Viewing and managing created polylines.
Changing the color of a polyline.
Locating polylines on the chart display.
Removing individual or all polylines from the system.
Deleting individual vertices from a polyline.
Explains the concept of a route as a sequence of waypoints.
Methods for creating new routes, including quick and planned routes.
Automatically constructing safe routes based on preset values.
Displaying and managing all saved routes.
Finding specific routes by name in the routes list.
Arranging the routes list by name or date.
Modifying route names, comments, and starting navigation.
Adding a new point to extend a route beyond the last waypoint.
Inserting new route points between existing route legs.
Relocating route points on the chart display.
Removing individual route points from a route.
Methods for deleting routes from the system.
Deleting a route using its pop-up menu.
Deleting routes directly from the saved routes list.
Deleting all routes via the main menu.
Setting the default speed for route calculations.
Toggling the visibility of saved routes on the chart.
Selecting and starting navigation for a saved route.
Adjusting route navigation parameters.
Navigating a route from the end point to the beginning.
Terminating active route navigation.
Defining the acceptable off-course distance before an alert.
Setting the radius for the arrival notification at waypoints.
Activating or deactivating arrival notifications for completed routes.
Configuring whether to keep or discard the destination after arrival.
Overview of the fish finder screen layout and indicators.
Selecting the correct transducer for the system.
Controlling the fish finder's sonar transmission.
Choosing between different display modes like single/dual frequency and zoom.
Displaying echoes in real-time for better fish and bottom identification.
Analyzing and displaying seabed composition (rock, gravel, sand, mud).
Using automatic adjustments for gain, clutter, TVG, and echo offset.
Adjusting the display position of the bottom echo.
Manually operating the fish finder with fixed gain settings.
Adjusting the gain (sensitivity) for optimal echo display.
Minimizing noise and unwanted signals on the screen.
Reducing interference from other equipment.
Filtering out faint echoes from plankton or sediment.
Features for highlighting echo strength and bottom edges.
Using TVG to display fish schools at different depths consistently.
Eliminating the transmission line to improve visibility near the surface.
Adjusting the speed at which scan lines move across the screen.
Measuring depth to objects and time intervals on the screen.
Reviewing previously displayed echo data.
Customizing color palettes, echo colors, and color bar visibility.
Feature for measuring fish length and displaying fish symbols.
Activating ACCU-FISH™ and choosing displayed fish information.
Adjusting the indicated fish size for accuracy.
Setting filters to show only specific fish based on size or depth.
Enhancing echo resolution for clearer fish detection.
Setting up various alarms for fish detection and seabed conditions.
Configuring the echo strength threshold for fish detection alarms.
Setting alarms for fish detected within a zone near the seabed.
Triggering notifications based on ACCU-FISH™ filter criteria.
Setting alarms for specific detected seabed compositions.
Resetting all Fish Finder menu settings to factory defaults.
Understanding the radar screen layout and its components.
Switching the radar between transmit and standby modes.
Enabling or disabling automatic tuning for clearer radar echoes.
Using Auto Rain feature to minimize clutter from rain or snow.
Adjusting the radar's detection range using pinch or slider.
Setting radar display orientation to North Up or Head Up.
Choosing the radar antenna source for data.
Toggling the visibility of the own ship icon on the radar screen.
Measuring distance and bearing to targets using radar tools.
Setting bearing reference to True North or Relative heading.
Offsetting the radar screen center to view specific areas.
Enlarging targets to improve visibility, especially for small targets.
Setting up zones to alert when targets enter or leave an area.
Customizing radar echo colors based on signal strength.
Selecting between Day and Night color schemes for the radar display.
Configuring how the bearing scale is referenced (True or Relative).
Accessing initial setup options like tune initialize and random pulse.
Resetting radar menu settings to factory default.
Introduction to the Automatic Identification System and its data.
Displaying and accessing information about AIS targets.
Understanding the symbols used to represent different AIS targets.
Setting the range within which AIS targets are automatically activated.
Setting a speed threshold to ignore slower AIS targets.
Displaying detailed data for an AIS target.
Toggling the display of AIS target identification names.
Viewing and managing the list of detected AIS targets.
Performing actions like Go To or Locate on selected AIS targets.
Setting alarms for Closest Point of Approach (CPA) and Time to CPA.
Setting alerts for active AIS SART devices.
Configuring the reception of ICOM data.
Displaying DSC message information, including distress calls.
Toggling the visibility of DSC symbols on the plotter.
Selecting the input device for DSC data.
Showing detailed information for DSC messages.
Toggling the display of DSC target identification.
Viewing and managing the list of DSC targets.
Deleting stored DSC messages from the system.
Viewing vessel information via connected sensors on the instrument display.
Selecting and showing specific instrument display pages.
Configuring split windows to show multiple instrument displays.
Examples of various instruments that can be displayed.
Switching between different instruments on a display page.
Modifying the data displayed by a specific instrument.
Removing an instrument page from the display configuration.
Using countdown timers and stopwatches as displayed instruments.
Configuring and displaying data in graph format.
Understanding how the system generates alarms and messages.
Configuring buzzer sound and interval for notifications.
Setting up alerts for navigation-related events.
Alerting when seabed is within a preset depth range.
Alerting when the vessel drifts beyond a preset anchor range.
Alerting when off-course by more than a preset distance.
Notifying when within a preset distance of the next waypoint.
Alerting when speed is above or below a preset limit.
Alerting when a preset trip distance is reached.
Alerting when water temperature is within or outside a preset range.
Alerting on sudden temperature changes (sheer) beyond a preset limit.
Setting notifications for fuel, water, and oil levels.
Setting alerts for wind speed, shift, and angle.
Resetting notification menu settings to factory defaults.
Viewing and managing the system's stored notifications and messages.
Accessing the list of system and alert notifications.
Categorizing notifications into alert and system types.
Applying filters to the notifications list by type or date.
Saving the notification log to a microSD card.
Detailed list of all general, AIS/DSC, and engine alarm notifications.
Setting date, time, UTC, and quick guide options.
Selecting units of measurement for various parameters.
Managing data such as routes, points, tracks, and settings on microSD cards.
Exporting points, routes, and tracks to a microSD card.
Importing points, routes, and tracks from a microSD card.
Backing up menu settings to a microSD card.
Restoring menu settings from a microSD card.
Saving the notification log to a microSD card in CSV format.
Searching for ports, tide stations, points, and other chart information.
Capturing and saving the current screen display.
Moving captured screenshots from internal memory to microSD.
Deleting screenshots from the internal memory.