Getting Started

- With Your Fathom One -

Safety Information

The Fathom One was built with your safety in mind. In order to make full use of the Fathom One please make sure you follow all protocols designed to keep you in control at all times.

The Fathom contains a Lithium Polymer battery which can be dangerous if not managed properly. Points of safety are listed below.

  • Should you experience a leak in your Fathom One DO NOT attempt to charge your drone. Immediately move the unit to a safe environment and contact support. If you must leave the unit unattended, leave the unit in an area where it cannot cause harm to and other person or property should the battery fail. Should the battery fail, the Fathom One front cap is designed such that it will vent smoke or fumes so as to stop any pressure build-up within the unit. Leaks are rare, but the best safety practice is to be prepared.
  • Never leave your Fathom One unattended while charging.
  • Always disconnect your drone while not in use. Leaving your drone connected to the main tether can drain the battery to a level that will be unsafe to recharge.
  • The Fathom One is meant to be used in the water. Extended use above water can cause overheating and damage to various components.
  • If your Fathom One shuts down during use due to low battery or high temperature, immediately bring it to the surface and disconnect it from the tether.
  • After every use, store the drone in a cool environment before attempting to charge the battery. Allowing the drone to cool down before charging is essential for battery health and safety.
  • Never attempt to charge the drone while it is powered on or connected to the main tether.
  • Never charge the drone in direct sunlight or in warm or hot conditions.

What's in the box?

Now that you've opened your Fathom One you should take stock of everything that came with it. If anything is missing be sure to reach out to use so we can fix it for you!

Inside your Fathom One box you will have a few things:

  • 1x - Fathom One Hull
  • 1x - Fathom One Right Thruster (labeled on thruster)
  • 2x - Fathom Tail and Left Thruster (interchangeable)
  • 9x - Fathom Thruster Attachment thumbnuts
  • 1x - 100' Fathom Tether
  • 1x - Fathom One Wifi Link
  • 1x - Fathom One Wifi Link Antenna
  • 1x - Fathom One Charging unit
  • Misc - Reading material (not pictured)

Attaching the thrusters

Attaching the thrusters is the first step towards diving with your Fathom One. 

First align the thrusters with the screws protruding from the Fathom One hull. Attach each of three wires onto the corresponding screws then slide the thruster over the screws. Note that you do not and should not remove any of the nuts that are tightened against the hull of the Fathom One. A table showing how the motors should be connected can be seen in this section. Note that one of your thrusters will be labeled "Right" meaning that it should be attached in the Right position of the drone if looking from the tail towards the front. The remaining two thrusters can be used interchangeably in the left and tail positions.

if the drone appears to be moving in a direction opposite of what you expect, check that you have the wires connected to the correct terminals, and when in doubt switch any two wires on the offending motor to correct the problem.

Ex: if the drone is spinning in circles when it should be moving straight forward, flip two wires on the motor that is running in reverse.

Turning on your Fathom One

After attaching all three thrusters to the Fathom One, the next step is to connect the tether to the Wifi Link. Be sure that you've screwed the antenna on to the Wifi Link on the gold connector. 

The ends of the Fathom One tether are the same, so either side can be plugged into the Wifi Link or the Fathom One. 

After plugging one end of the tether into the Wifi Link, plug the other end of the tether into the Fathom One. The tether can only be connected in one direction, so if it doesn't slide in, check the plastic fins on the inside of the tether to line it up with the slots on the plug. After plugging in the tether to both sides make sure that you tighten down the screw that keeps the tether secured in the plug. Failure to tighten this plug can result in anything from a loss in connection, to losing your drone while piloting it in the water.

Immediately after plugging the tether into the Fathom One, you should hear three beeps as it initializes. The Fathom One will beep like this for roughly 45 - 60 seconds as it starts up. You will hear occasional beeps as well as see flashing lights while it starts up. Once the unit has completed it's final beep and calibration, you can connect to the Wifi network generated by the Fathom One Wifi Link. Open up the Wifi settings on the device you will be using to pilot the Fathom One and select the network. On most early drones this will be called "ALFA". Once you have connected to the Wifi network, you can open the Fathom One app, and you will be ready to dive!

Step 1: Plug one end of your tether into your Fathom One Wifi Link.

Pre-dive check

Before you get started and toss your Fathom One in the water, there are a couple things that you'll want to check.

  • Check to make sure the tether is firmly connected to both the Fathom One and the Wifi Link. Be sure that the plug has been firmly screwed into place.
  • Check that the charge port of your Fathom One is closed and firmly tightened. 
  • Check that the thumbnuts holding your thrusters in place are firmly tightened.
  • Check your surroundings. Be aware of the wildlife and plant growth in your area as well as other people. Check for watercraft, swimmers, or any other object or debris that you might cause damage to or could damage the Fathom One.
  • For optimal dive time, make sure that your drone has been charged prior to use.

How to use the Fathom app

If you have not already downloaded the app, click the app link in the header or navigate to to download the version for your device.

After opening the application, you will see the main menu with options to "Dive", "Observe", check your "Dive Log", and adjust "Options". Note that you will be unable to use any of these options if you are not connected to Fathom One Wifi network.

Pressing the Dive option in the main menu will bring you to a screen showing a live video feed from your Fathom One. The screen you will also see telemetry that tells you about the position of your Fathom one.

  1. Home Button - Will bring you back to the app's main menu
  2. Wifi icon - Shows the connection strength to the Fathom Wifi Link.
  3. Battery Indicator - Shows the current charge of your Fathom One.
  4. Compass Heading - Shows the current heading of the Fathom One.
  5. Fathom Pro Mode - Tapping this icon will allow you to access pro options like increasing the speed of your Fathom One's motors. Speed options will appear in the bottom (12 & 13).
  6. Depth - Shows the current approximate depth of the Fathom One.
  7. Settings - Allows access to several settings (not currently on iOS)
  8. Lights - Will illuminate the front lights on the Fathom One
  9. Record - Press to start recording video on your Fathom One. Press again to stop the recording.
  10. Thrust control - This slider controls the forward and backward motion of your Fathom One. Slide up to move forward, slide down to reverse.
  11. Pitch and Steering - this slider controls where your Fathom One is pointed. Slide left to turn left, right to turn right. Pitch controls by default are like airplane controls. Pushing up will pitch the drone down, pulling down will pitch the drone up. This can be inverted in the Options menu.
  12. Speed Control Gears - Tap to access higher speed levels. Currently limited to gears 1-3.
  13. Pitch Control Gears - Tap to access higher speed levels with the rear thruster. Currently limited to gears 1-3
Pressing the Observe option in the main menu will bring you to a screen showing a live video feed from your Fathom One. You will not see any of the telemetry from the Fathom and you will not be able to control the drone.

Dive Log
The Dive Log can be used to download videos that have been recorded on your Fathom One by taking you to the video manager.

*There is currently a bug that will crash the app if Dive log is pressed in the Android version of the app* 

To access the Video Manager without using the app, simply connect to your Fathom One's wifi network on any device or computer. Open a web browser and navigate to the following URL:

This will bring up the video manager and allow you to convert videos to MP4 format, or delete recordings.

*There is a current bug that will crash the drone when attempting to download videos on Apple iPhones and iPads. In order to download videos either use an Android device, laptop, or desktop and connect to your Fathom One as shown in the steps above.*

Click settings to access several settings for your drone. Included are options to invert your pitch controls, calibrate your depth sensor, calibrate your compass, and calibrate your accelerometer. Please note that all of those calibrations are done prior to sending out your Fathom One and should not need to be repeated. Do not change your Drone's IP address unless instructed to. Changing the IP address of your drone will stop it from functioning. If you do change it make sure you return it to its original setting of

Downloading videos

The built in camera on the Fathom One can be used to captured videos of your adventures right to the Fathom One's memory! Downloading videos after your dive is straight forward, but here is an explanation of how to do it.

  1. Connect your Fathom in the same way you would normally do before diving.
  2. Connect to the Fathom Wifi network.
    *Note currently to download videos from your Fathom One you will need to use either an Android device, or laptop/desktop computer. You cannot currently use mobile Apple devices (iPhone or iPad) to download videos.*
  3. After connecting, open a web browser and navigate to the URL: to access your Fathom One's Video Manager.
  4. By default, videos are stored in a format called H264. Pressing the "Convert" option in the top right will convert your videos to MP4 format so that they can be easily downloaded.
  5. After converting your videos, simply press the download arrow to download the videos off the Fathom One's memory. 
  6. Once the downloads are complete you can keep the videos on the drone's memory or delete them to free up more space.

Charging your Fathom One

Taking care of the battery on your Fathom One is extremely important to a good experience. Here are a few instructions on how to charge your Fathom One.

  • Should you experience a leak in your Fathom One, DO NOT attempt to charge it. Doing so could severely damage the battery on board.
  • Never leave your Fathom One unattended while charging, including charging your drone overnight.
  • The Fathom One contains a LiPo battery, be sure to select the LiPo setting when charging your drone or you will not get a full charge.
  • Always check the indicator lights on the smart charger when you begin charging and look for anything out of the ordinary.
  • Never charge your Fathom One while the main tether is attached. Always disconnect the main tether before charging your drone.
  • When charging is complete always tightly close the charging port of the Fathom One and check prior to placing the unit in the water for normal use.
  • Refer to the final picture in the slide show for information on codes shown on the Smart Charger

Care and maintenance

Taking care of your Fathom One is important to keeping it running smoothly and making sure you have a good experience. Here are a few points to make sure you get the most out of your unit.

  • Reduce the risk of water getting into the tether port of your Fathom One by holding it upside down when removing the tether after a dive.
  • After diving in saltwater, treat your Fathom One like you would any other piece of equipment you use in saltwater. Be sure to rinse the entire unit with freshwater and take special care to rinse the motors. The easiest way to do this would be by filling a container with freshwater and piloting the drone (run the motors) in order to clear out any saltwater residue that will leave deposits on the unit when it dries. 
  • Always disconnect the main tether when not in use so as not to drain the battery.
  • Always be aware of your surroundings. Where you pilot your Fathom One is up to you but by piloting your unit in unknown conditions you increase the risk of damaging the unit.
  • If you found that you had a question that wasn't answered you can also check our FAQ section for more information.
  • If you have any questions about your unit, please contact us at