How to set up a smart sonar

and use the data to catch more and catch bigger

Look at your smart sonar as a device of many uses, a device that needs adjusting as conditions dictate. Unless you own a unit that comes from the factory with pre-programmed settings (Deeper START) push plenty of buttons. Here are some common adjustments

Fishing/Scanning modes

The way your sonar readings are shown on screen will vary depending on the display options and sonar mode you select. To change the sonar mode, go to Settings in the top menu bar and find the Sonar mode section. Each mode is described in detail below.

For boat or kayak fishing use Boat Mode

In this mode, the Deeper App instantly connects to the GPS in your smartphone or tablet to create real-time bathymetric maps. You will see the sonar returns on the right side of the screen and the map on the left (Settings > Sonar Mode > Boat Mode).

For shore fishing PRO+ users should choose Onshore Mode

Onshore GPS Mode operates in the same manner as Boat Mode, but instead of using your smartphone’s GPS, Onshore GPS Mode uses the internal GPS receiver installed in the Deeper PRO+. You will see the sonar returns on the right side of the screen and the map on the left (Settings > Sonar Mode > Onshore GPS Mode).

For shore fishing with PRO use Standard Mode

The sonar return will be full screen.Bathymetric maps will not be created when shore fishing with PRO model (Settings > Sonar Mode > Standard Mode).

For ice fishing use Ice Fishing Mode

It has a traditional ice fishing flasher display on the left and the vertical flasher displayed on the right. It lets you track the movement of even the smallest lure or bait in real time. In Ice fishing mode the Deeper App will record and save all the ice holes you fish directly onto an expandable map on the left side of the screen (Settings > Sonar Mode > Ice Fishing Mode).

Screen Adjustments and Alarms

Adjusting your screen and alarms will help you set up your Deeper sonar for the most effective fishing.

  • Brightness
  • Screen Color Mode
  • Vertical Flasher
  • Night Fishing
  • Depth and fish alarms
  • Fish Depth
  • Brightness

    You can change the Brightness of the application through Settings. Brightness needs to be adjusted according to light levels to see more details.

  • Screen Color Mode

    Screen Color Mode allows you to choose the most convenient color palette for viewing your sonar data based on the environment, conditions and the time of day you are fishing. Alongside the Classic color palette, there are two other options – Day and Night - which can be used for the best viewing of your sonar readings in either bright sunny conditions (Day mode) or low light conditions (Night mode).

  • Vertical Flasher

    Turning on the Vertical Flasher enables you to see the intensity of the sonar returns your Deeper is receiving. It is automatically on in Ice Fishing Mode, for other modes you can turn it on through the settings. Vertical Flasher is useful when you want to see what is happening right under your sonar without having to guess where in the sonar cone your fish is located.

  • Night Fishing

    The Night Fishing feature should be turned on when fishing at night or in low light conditions. In order to use it you will need to replace the standard cover with a Deeper Night Fishing Cover first. Night Fishing mode activates a blinking light that is only visible through a translucent cover.

  • Depth and fish alarms

    The Depth Alarm feature enables or disables sound notifications, which are triggered when the bottom depth picked up by your Deeper is within a specified depth range. This is most commonly used when boat fishing. If you know that fish is usually hiding somewhere between 4 and 6 meters, just set these limits on the depth alarms and your app will notify you when you are in the right place. TheFish Alarm feature enables sound notifications when fish are picked up by your Deeper. Fish alarms only work when Fish Icons is enabled.

  • Fish Depth

    The Fish Depth tags feature enables or disables depth readings that are displayed next to the fish icons. You can choose the distance from surface or distance from the bottom. With this information you will be sure that your lure is at the right place to hook that catch.

Beam angle/frequency

Different Wave length

A sound wave at a low frequency of 90kHZ is about 1,6 cm long (0,6 in). It will bounce off any fish whose air bladder exceeds 1,6 cm (0,6in) high. A sound wave at a high frequency of 200khz is about 0,5cm long (0.2incm).  It will bounce off any fish whose air bladder exceeds 0,5cm long (0.2in). So, the higher the frequency, the better the detail on your screen.

Choose the correct angle

Choosing a beam angle correctly will have a great impact on your sonar performance. Deeper PRO and PRO+ has 2 frequencies that create different scanning angles. Higher frequency also lessens background noise and works well at higher boat speeds. But since water absorbs high-frequency signals faster than low frequency signals, choose low frequency to find fish in deep water (197ft or 60m). For finding structure, we recommend using a high frequency sonar beam in shallow water and low frequency in deep water.

Differences between beams

To understand beams even better, think of narrow vs wide beam as flashlight vs floodlight. Like a flashlight beam, a narrow transducer cone shoots directly under the boat. But, like a floodlight, a wider cone finds more fish off to the side. The transducer’s crystal determines cone angle. Unlike some flashlights that allow us to change their beam angle, a transducer’s cone angle is fixed. A crystal that produces a narrow cone seems more powerful than the one that produces a wide cone. Why? Because the narrow cone beams the power into a smaller area.

Cone Diameter

So even though a narrow beam is stronger and more precise, it covers a smaller area. The Deeper PRO/PRO+ narrow beam cone’s diameter will be ¼ of the depth. So, when you are scanning in a depth of 2m (6.5ft), the narrow beam will cover 50cm (1.6ft) of the bottom at a time. Wide beam, on the other hand, covers a larger portion – almost the same as the depth you are scanning, so in the same 2m (6.5ft) depth, you will be covering 2 meters of the bottom at a time.


Sensitivity is like volume control on a hearing aid, it is the sonar‘s ability to receive echoes. Beginning anglers often set their sonar sensitivity too low. They like a nice, clean screen.  Pro anglers set the sensitivity high – 70% to 90% of the maximum. They tolerate more clutter. That’s why they see more fish. The best strategy is setting the sensitivity to 100%, then backing off until you‘re satisfied with your screen‘s appearance.

 If the clutter runs deep, reduce sensitivity until the clutter lessens, yet fish remain. If this doesn’t work, switch to lower frequency Wide beam. No matter where you set the sensitivity, your sonar sends out the same amount of power. Sensitivity just controls how much the sonar amplifies each returning signal.

This might sound like a lot of work but it’s not. Most of these settings we only adjust just before fishing. Others, only when dark clouds appear, or we change our method of fishing. Granted, you are on the water to fish not fiddle with gadgets. Remember you can practice in your driveway in Simulation mode. If you take the time to master your sonar features, you’ll fish more effectively. Happy fishing!