Garmin GPSMAP 8700 Black Box Owners Manual - Page 39
Advanced Sonar Settings, Traditional, Garmin ClearVü, and SideVü Transducer, Installation Settings,
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you avoid running aground (Setting the FrontVü Depth Alarm, page 33). This alarm is available only with Panoptix FrontVü transducers. Water Temp.: Sets an alarm to sound when the transducer reports a temperature that is 2°F (1.1°C) above or below the specified temperature. Contour: Sets an alarm to sound when the transducer detects a suspended target within the specified depth from the surface of the water and from the bottom. Fish 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. Advanced Sonar Settings From a Traditional sonar view, select Menu > Sonar Setup > Advanced. Shift: Allows you to set the depth range on which the sonar is focused. This allows you to zoom in a higher resolution in the focused depth. When using shift, bottom tracking may not work effectively, because the sonar looks for data within the depth range of the focused area, which may not include the bottom. Using shift also can impact the scroll speed, because data outside the depth range of the focused area is not processed, which reduces the time required to receive and display the 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. Btm. Srch. Limit: Limits the search for the bottom to the depth selected when the Range setting is set to Auto. To minimize the length of time it takes to find the bottom, you can select a depth to limit the search for the bottom. The device will not search for the bottom deeper than the selected depth. Traditional, Garmin ClearVü, and SideVü Transducer Installation Settings From a Traditional, Garmin ClearVü, or SideVü sonar view, select Menu > Sonar Setup > Installation. Transmit Rate: Sets the length of time between sonar pings. Increasing the transmit rate increases the scroll speed, but it may also increase self-interference. Reducing the transmit rate increases the spacing between transmit pulses and can resolve self-interference. This option is available on the Traditional sonar view only. Transmit Power: Reduces transducer ringing near the surface. A lower transmit power value reduces transducer ringing, but can also reduce the strength of the returns. This option is available on the Traditional sonar view only. Filter Width: Defines the edges of the target. A shorter filter more clearly defines the edges of the targets but may allow more noise. A longer filter creates softer target edges and may also reduce noise. This option is available on the Traditional sonar view only. Flip Left/Right: Switches the SideVü view orientation from left to right. This option is available on the SideVü sonar view only. Restore Sonar Defaults: Restores the sonar settings to the factory default values. Allows you to change the transducer, view details about the transducers, and save details to a memory card. Sonar Frequencies NOTE: The frequencies available depend on the device and trandsucers being used. Adjusting the frequency helps adapt the sonar for your particular goals and the present depth of the water. Higher frequencies use narrow beam widths, and are better for high-speed operation and rough sea conditions. Bottom definition and thermocline definition can be better when using a higher frequency. Lower frequencies use wider beam widths, which can let the fisherman see more targets, but could also generate more surface noise and reduce bottom signal continuity during rough sea conditions. Wider beam widths generate larger arches for fish target returns, making them ideal for locating fish. Wider beam widths also perform better in deep water, because the lower frequency has better deep water penetration. CHIRP frequencies allow you to sweep each pulse through a range of frequencies, resulting in better target separation in deep water. CHIRP can be used to distinctly identify targets, like individual fish in a school, and for deep water applications. CHIRP generally performs better than single frequency applications. Because some fish targets may show up better using a fixed frequency, you should consider your goals and water conditions when using CHIRP frequencies. Some transducers also provide the ability to customize preset frequencies for each transducer element, which enables you to change the frequency quickly using the presets as the water and your goals change. Viewing two frequencies concurrently using the split-frequency view allows you to see deeper with the lower frequency return and, at the same time, see more detail from the higher frequency return. NOTICE Always be aware of local regulations on sonar frequencies. For example, to protect orca whale pods, you might be prohibited from using frequencies between 50 to 80 khz with in ½ mile of an orca whale pod. It is your responsibility to use the device in compliance with all applicable laws and ordinances. Selecting the Transducer Frequency NOTE: You cannot adjust the frequency for all sonar views and transducers. You can select which frequencies appear on the sonar screen. NOTICE Always be aware of local regulations on sonar frequencies. For example, to protect orca whale pods, you might be prohibited from using frequencies between 50 to 80 khz with in ½ mile of an orca whale pod. It is your responsibility to use the device in compliance with all applicable laws and ordinances. 1 From a sonar view, select Menu > Frequency. 2 Select a frequency suited to your needs and water depth. For more information on frequencies, see Sonar Frequencies, page 31. Creating a Frequency Preset NOTE: Not available with all transducers. You can create a preset to save a specific sonar frequency, which allows you to change frequencies quickly. 1 From a sonar view, select Menu > Frequency. 2 Select Manage Frequencies > New Preset. 3 Enter a frequency. Turning On the A-Scope NOTE: This feature is available in the Traditional sonar views. Sonar Fishfinder 31
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