FishHunter Military Grade Manual

FishHunter Sonar Owner’s Manual

Product Description And Specifications

FishHunter sonar uses ultrasonic waves to measure the depth of the water body, the topography of the bottom, and to pinpoint any fish in the water body. The device can also measure the water temperature using a built-in thermometer. All this information is broadcast to smart phones using Bluetooth wireless communication.

Model FishHunter
Body Material Polycarbonate and silicone.
Frequency Range 381kHz
Pulse Type Continuous wave.
Pulse Length 25usec ~ 250 usec (10 ~ 100 wave length) The pulse length increases as the detection range increases and varies.
Measurable Depth We provide users adjustable depth ranges with automatic pulse width adjustment. The adjustable depth ranges allow the users to choose the optimum range profile to produce the most precise data for the body of water they are scanning. At present, we're officially providing 10, 20 & 30m depth.
Bluetooth Distance 20 ~ 40 m According to the weather (maritime situation), it can change if FishHunter body is shaken.
Weight FishHunter body 117.5 g, battery charging dock 24 g, USB-mini cable 16 g.
Power Supply Internal 3.6 VDC 600 mAh battery.
Power Consumption 0.1 mAh while waiting (or sleeping). 60 mAh while in use. If the communication distance is long, it can go up to 150 mAh instantaneously.
Operating Time 6-9 hours if used on the water surface continuously. 500+ hours if it is waiting (or sleeping/not in use). It can vary if the communication distance changes, especially if it is being used on the water surface.

Product Configuration

From left to right: sonar body, battery charging dock, USB-mini cable.

  • sonar body: Floats on the water, collects information regarding fish distribution, seabed bottom topography, water temperature, and communicates this data to smart devices wirelessly.

  • Battery charging dock: Charges the Lithium polymer battery that is inside sonar body. Please be careful regarding the direction when connecting it with sonar body and do not force the sonar onto the charging base. It should easily lock into place with the “bottom key” inserted into the charging base.

  • USB-mini cable : Connects battery charging dock and USB terminal to any type of USB charger including computer USB, iPhone charger or USB charger.

How To Use The Product

Step 1: Turning on the sonar
Connect sonar body through the top of the sonar hook using a fishing line or other type of line and toss the sonar body into the water while holding onto the other end of the line.PLEASE NOTE: In order to save battery life, the sonar ONLY works when it is placed in/on the water surface. An internal switch turns ON when it is placed on the water surface and only then will it begin to transmit a Continuous Wave (CW) signal that is pulsed over a dynamically adjustable pulse width.
Step 2: Pairing your sonar and phone
  1. Ensure your sonar is fully charged by following the charging instructions below. Your sonar is fully charged when the light located in the cone on the top of the sonar turns green while sitting on the charging base and while the charging base is plugged into a charging source.
  2. Place you sonar into water.
  3. Go into the Bluetooth setting on your phone/tablet.
  4. Put your phone into “pairing” mode.
  5. Look for “FishHunter” to appear in the list of available items your mobile device can pair with.
  6. Select the FishHunter sonar from the list.
  7. Your mobile device and your sonar should now be paired together.


Step 3: Starting the FishHunter app to see sonar readings.


After starting the FishHunter application, select the Sonar tab on the menu. If Bluetooth connection has been established between your mobile device and your sonar, this will prompt the sonar start screen. Pressing the sonar image in the center of the screen will allow the sonar body to receive data and transmit it to your smartphone.


However, if the Bluetooth connection has not been established between your mobile device and your sonar, you will see the screen on the left.
When viewing the sonar in its raw data form, the red area indicates strong reflections of the signal underwater and the blue area indicates weak reflections (because there is nothing there to reflect the sound back – its empty water).

  1. Ultrasound transmission line. On the screen, it means the water surface.
  2. BLUE - The color blue means that there is nothing (no object) there to reflect sound.
  3. GREEN - All colors except blue (such as green, yellow or red) indicate that there is something in that space... Is it a fish?
  4. RED - The color red means that the reflected signal is very strong and from this example, we can guess that this indicates hard bottom that is perhaps sand or rock.
  5. While the sonar body is moving, it may be the case where strong signals shown in 4 suddenly change to a relatively weak signal as shown in 5. This could indicate that the seabed material has changed to a softer substance, such as mud.
When viewing the sonar in the interpreted mode, you can see the bottom, the vertical depth scale and any fish visible at the time of the reading.


  1. The "DONE” button lets you turn off the sonar and return to the previous screen.
  2. This indicates the temperature and the depth of the water.
  3. This indicates battery life.
  4. In the sonar.’s settings, you can change the depth, sound, reading level, battery life indicator and temperature.
  5. The “Take Photo” option allows you to take a sonar picture.
  6. Click on the “Drop Pin” button to add a pin to the map.
  7. The “On/Off” switch turn sonar on or off.
  8. This ruler indicates the depth of each fish.
  9. The fish symbol means that there could be a fish in the indicated area.
  10. This indicates hard bottom that is either sand or rock.
  11. The slider gives you access to your sonar history.

How To Maintain The Product

After using FishHunter sonar, always clean the bottom of the device with a damp towel and then dry it off entirely before charging. Scrape the terminals periodically to remove any build-up of oxidation or other material to ensure a good connection between the device and the charging base. Warning: Operating two or more sonar bodies very close together will cause interference when transmitting and receiving ultrasonic data.

How To Recharge Sonar

The connection between the USB-mini cable and the battery charging dock is shown below. Upon connecting the USB-mini cable with the USB port of a laptop or USB power supply adapter, the charging dock LED lights up red and will stay red for the entire time the sonar is connected and charging. In addition, you will also notice that the top of the sonar will turn yellow when the sonar is charging. This light will turn green when the sonar is fully charged. It takes about six hours to fully charge a completely empty sonar battery.


NOTE: Make sure the bottom of the sonar is dry before recharging it – wipe any water or dirt/weeds off of the bottom and dry the device thoroughly before placing it on the charger.

USAGE VIDEOS

HOW TO CONNECT YOUR MILITARY GRADE SONAR

FISHHUNTER SONAR DEMONSTRATION

FISHHUNTER MAPS & LOCATIONS

HOW TO USE THE FISHHUNTER CATCHES LOGBOOK