GPSMAP® 6000/7000 Series Owner’s Manual 107Sonar• For the GPSMAP 7000 series, use the on-screen keyboard.3. Select Done.Setting the Fish AlarmNote: This feature is available only on the GSD 22.You can set an alarm to sound when the chartplotter detects a suspended target of the specified size.1. From the Home screen, select Configure > Alarms > Sonar > Fish.2. Complete an action:• Select to sound an alarm for all fish sizes.• Select to sound an alarm for medium and large fish only.• Select to sound an alarm for large fish only.Setting the Contour Fish AlarmNote: This feature is available only on the GSD 24 and GSD 26.You can set an alarm to sound when the chartplotter detects a suspended target within the specified depth rangeand the specified color range.1. From the Home screen, select Configure > Alarms > Sonar > Fish > Contour.2. Select top.3. Enter a distance from the top to show an alarm for targets near the surface:• For the GPSMAP 6000 series, use the Rocker or Numeric Keypad.• For the GPSMAP 7000 series, use the on-screen keyboard.4. Select Done.5. Select Bottom.6. Enter a distance to the bottom to sound an alarm for targets near the bottom of the water:• For the GPSMAP 6000 series, use the Rocker or Numeric Keypad.• For the GPSMAP 7000 series, use the on-screen keyboard.7. Select Done.8. Select Intensity.9. Select a color, and select Back.Setting the Bottom Fish AlarmNote: This feature is available only on the GSD 24 and GSD 26.You can set an alarm to sound when the chartplotter detects a suspended target within the specified range fromthe bottom and the specified color range.1. From the Home screen, select Configure > Alarms > Sonar > Fish > Bottom.2. Select Span.3. Enter a distance to the bottom to sound an alarm for targets near the bottom of the water:• For the GPSMAP 6000 series, use the Rocker or Numeric Keypad.• For the GPSMAP 7000 series, use the on-screen keyboard.4. Select Done.5. Select Intensity.6. Select a color, and select Back.Transducer ConfigurationSetting the Keel OffsetThe keel offset compensates for the surface reading for the depth of a keel, making it possible to measuredepth from the bottom of the keel instead of from the transducer location. Enter a positive number to offset fora keel. You can enter a negative number to compensate for a large vessel that may draw several feet of water.