FishAlarms

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum Dan,

Regarding Fish Alarms, this it is recommended that you verify that your Dragonfly display has been updated with the latest available Raymarine product software update and if not update its software accordingly. Dragonfly display's may be configured to alarm when fish are detected above the Fish Shallow Limit, below the Deep Fish Limit, or will alarm when Fish are detected at any depth (FISH DEPTH LIMITS->OFF).

Increasing the value of the FISH SENSITIVITY Fish Alarm setting will decrease the threshold level for the strength of the returned sonar signal which will trigger the Fish Alarm. As such, increasing the numerical value of Fish Sensitivity setting will cause the sounder to be more sensitive. Should one desire to detect bait fish, then the Fish Sensitivity level would be adjusted to a higher value than would be used to alarm for larger fish.

With respect to Gain/Contrast/and Noise Filter sensitivity features, the AUTO setting is the most commonly used setting. However, should you find that your Dragonfly is not satisfactorily marking fish in the AUTO setting, then you may want to consider increasing Gain and Contrast settings and possibly decreasing the Noise Filter setting to mark more fish. Should the Fishfinder application be alarming when fish are not actually present, then you may want to consider decreasing Gain and Contrast settings and possibly increasing the Noise Filter setting.