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1

Complete an action, based on the location of the transducer:
• If the transducer is installed at the water line 

À

, measure 

the distance from the transducer location to the keel of the 

boat. Enter this value in steps 3 and 4 as a positive 

number to display depth below keel.

• If the transducer is installed at the bottom of the keel 

Á

measure the distance from the transducer to the water 

line. Enter this value in steps 3 and 4 as a negative 

number to display water depth. Enter a 0 in this value to 

display depth below keel and depth below transducer.

2

Select 

Settings

 > 

My Vessel

 > 

Keel Offset

.

3

Select   or   based on the location of the transducer.

4

Enter the distance measured in step 1.

Setting the Water Temperature Offset

You can set the temperature offset to compensate for the 

temperature reading from a temperature-capable sensor.

1

Measure the water temperature using the temperature-

capable transducer that is connected to the device.

2

Measure the water temperature using a different 

thermometer or temperature sensor that is known to be 

accurate.

3

Subtract the water temperature measured in step 1 from the 

water temperature measured in step 2.
This is the temperature offset. Enter this value in step 5 as a 

positive number if the sensor connected to the device 

measures the water temperature as being colder than it 

actually is. Enter this value in step 5 as a negative number if 

the sensor connected to the device measures the water 

temperature as being warmer than it actually is.

4

Select 

Settings

 > 

My Vessel

 > 

Temp. Offset

.

5

Use the arrow keys to enter water temperature offset 

measured in step 3.

Calibrating a Water Speed Device

If you have a speed-sensing transducer connected to the 

chartplotter, you can calibrate that speed-sensing device to 

improve the accuracy of water-speed data displayed by the 

chartplotter.

1

Select 

Settings

 > 

My Vessel

 > 

Calibrate Water Speed

.

2

Follow the on-screen instructions.
If the boat is not moving fast enough or the speed sensor is 

not registering a speed, a message appears.

3

Select 

OK

, and safely increase the boat speed.

4

If the message appears again, stop the boat, and ensure the 

speed-sensor wheel is not stuck.

5

If the wheel turns freely, check the cable connections.

6

If you continue to get the message, contact Garmin product 

support.

Alarms Settings

System Alarm

Select 

Settings

 > 

Alarms

 > 

System

.

Device Voltage

: Sets an alarm to sound when the battery 

reaches a specified low voltage.

Sonar Alarms

Select 

Settings

 > 

Alarms

 > 

Sonar

.

Shallow Water

: Sounds when the water depth is shallower than 

the specified depth.

Deep Water

: Sounds when the water depth is deeper than the 

specified depth.

Water Temp.

: Sounds when the water temperature varies more 

than ± 2°F (± 1.1°C). Alarm settings are saved when the 

device is turned off.

NOTE: 

You must connect the device to a temperature-

capable transducer to use this alarm.

Fish

: Sets an alarm to sound when the device detects a 

suspended target.

 sets the alarm to sound when fish of all sizes are 

detected.

 sets the alarm to sound only when medium or large 

fish are detected.

 sets the alarm to sound only when large fish are 

detected.

Restoring the Factory Default Settings

NOTE: 

This deletes all settings information you have entered.

1

Select 

MENU

 > 

System

 > 

System Information

 > 

Factory 

Settings

.

2

Select an option.

Appendix

Registering Your Device

Help us better support you by completing our online registration 

today.
• Go to 

my.garmin.com

.

Appendix

7

Summary of Contents for FF 350 Plus

Page 1: ...FF 350 Plus Owner s Manual...

Page 2: ...is manual without obligation to notify any person or organization of such changes or improvements Go to www garmin com for current updates and supplemental information concerning the use of this produ...

Page 3: ...cies 4 Selecting Frequencies 4 Sonar Gain 4 Setting the Gain Automatically 4 Setting the Gain Manually 4 Adjusting the Range of the Depth Scale 4 Showing and Customizing the Overlay Numbers 4 Sonar Se...

Page 4: ......

Page 5: ...t contact information Selecting the Transducer Type If you are not using the included transducer you must set the transducer type to enable the sonar to function optimally If you are using the include...

Page 6: ...phical sonar data on the home screen using the Depth Data Graph screen You can view temperature data on the home screen using the Temperature Data Graph screen 1 From the home screen select Customize...

Page 7: ...data You can zoom in to the focused area which enables you to evaluate target returns more closely at a higher resolution than just zooming alone The shift zoom view is not available on all sonar scre...

Page 8: ...you must set each frequency separately 1 From a sonar view select GAIN 2 Select Enable Auto Gain 3 Select an option To display higher sensitivity weaker sonar returns with more noise automatically se...

Page 9: ...olor Scheme Sets the color scheme Edge Highlights the strongest signal from the bottom to help define the hardness or softness of the signal A Scope Displays a vertical flasher along the right side of...

Page 10: ...vides information about the device and the software version Garmin Devices Provides information about connected Garmin devices Factory Settings Restores the device to factory settings NOTE This delete...

Page 11: ...brating a Water Speed Device If you have a speed sensing transducer connected to the chartplotter you can calibrate that speed sensing device to improve the accuracy of water speed data displayed by t...

Page 12: ...uld push firmly so that it is fully seated Make sure the power source is generating power You can check this several ways For example you can check whether other devices powered by the source are func...

Page 13: ...ction 4 O overlay numbers 4 5 P pages 2 See sonar panning 1 product registration 7 product support 1 R registering the device 7 S screen brightness 1 scroll speed 5 settings 1 6 system information 6 s...

Page 14: ...55 69 33 99 39 02 36 699699 52 001 855 792 7671 0800 427 652 0800 0233937 47 815 69 555 00800 4412 454 44 2380 662 915 35 1214 447 460 386 4 27 92 500 0861 GARMIN 427 646 27 0 11 251 9800 34 93 275 4...

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