Could ROVs be used in law enforcement?

Top underwater drone ROV 2021

Have you always wanted to find treasures underwater? Here is a great solution to use a remote controlled underwater drone or ROV vehicle.

You are probably familiar with aerial drones and pretty much the same thing is available for underwater. However, there are still some technical difficulties for underwater drones. Water pressure, light, currents and so on.


Technically it should be referred to as a remotely operated underwater vehicle (ROUV), but is usually only referred to as a ROV (remotely operated vehicle). It is an unmanned underwater vehicle, sometimes referred to as UUV in German.

First things first: You can operate the ROV underwater drone from the outside and you don't have to be wet or in the water. The outside can be a ship, a dinghy, a floating island, or just offshore.

Cable connection for energy and information transmission

Due to the water tightness, a normal remote control would not work under water and the connection would break directly below the water surface. The ROV is connected with a cable connection for the transmission of energy and information. This is a cable that is connected to the underwater drone and from there to the mother ship. It is then normally connected to the remote control from the mother ship via Bluetooth or WiFi.

Most cable connections are built robustly so that they can also be pulled with a tension of approx. 50 kg.

Underwater drones ROVs can be used in many different ways

  • Teaching area
  • Investigations
  • military
  • science
  • Broadcast usage
  • Fish farming
  • Hobby use
  • Public safety and law enforcement
  • Treasure hunt
  • Inspection of the boat hull
  • Reservoir inspection
  • Dam inspection
  • Aquarium inspection

Attachments to ROV

Depending on which model you own or want to buy, you can buy sophisticated accessories such as a robotic arm, a claw, scissors, a wire cutter, drill, sonar, a soil sampler or other attachments.


Some underwater drones come with a removable battery so you don't have to wait for the drone to charge to complete your next mission. Then you can bring the underwater drone back and replace it. Insert your spare battery and off you go.

The battery sizes are usually kept below 100 Wh due to the authority for flight regulation and flight control.


The latest models have a 4k UHD camera with a wide angle lens. As a rule, you can also film in slow motion. Many models have image stabilization.
You can also take pictures with the same camera, mostly around 12 MP.

Underwater lights of an ROV

You can have built-in LED lights or sometimes attach external lights to your underwater drone.

Usable depth of underwater drones

Underwater drones and ROVs are usually designed to a depth of 100 m (330 ft), but some can also reach up to 200 m (660 ft) and up to a maximum horizontal radius of 200 m (660 ft).


Most underwater drones reach speeds of around 3 knots 5.5 km / h


Most underwater drones are equipped with 6-8 thrusters (vertical, horizontal and sometimes at a 45 ° angle). Due to wear and tear, propellers are also replaceable. The latest versions are fully maneuverable. Sideways, arc rotation, 90 ° up / down, 360 ° tilt / yaw / roll.


Your underwater drone should be equipped with a depth sensor in order to be able to carry out an intelligent hovering in the desired depth and direction or a targeted close-up or postural positioning.


The weight of an underwater drone starts at approximately 4.0 kg (8.8 lbs) and can be up to approximately 10 kg (22 lbs) with all attachments.

Live broadcast and social media sharing

Many underwater drones support the live broadcast. Take photos and videos, edit them quickly and share them on their social media.

Testing an ROV

Most ROV's underwater drones are tested in swimming pools and lakes where the water is calm. However, some have tested their own personal ROV's in the ocean. However, this leads to some difficulties due to large waves and currents, the underwater drone can deviate from the course or have difficulty penetrating the surf, this is due to the small size of the motors.

Our recommendations for underwater drones

QYSEA FIFISH V6s underwater drone ROV with gripper arm

  • Bionic exterior design, strong power, flexible operation
  • 100 N clamping force with clamp locking function
  • 100N tensile force
  • UHD camera 166˚ ultra wide angle
  • Image stabilization
  • Slow motion at 240 fps
  • 12 megapixel images
  • RAW image in DNG
  • LED headlights with 2 x 2000 lumens
  • Maximum depth 100 m.
  • Easy to handle
  • Drone app
  • Forward backward, move up and down, tilt up and down and lock the depth, support ± 45 ° adjustable tilt mode.
  • Depression
  • The speed is up to 2m / s (7.2 km / h).
  • 64 GB memory card (included)
  • Comes with VR glasses VR INTUITIVE The world's first motion sensor headset that allows you to rotate the drone seamlessly and intuitively underwater
  • Battery life 6 hours of diving time
  • Uses 14,000mAh, 155Wh battery
  • Dimensions 38.1 x 33.02 x 14.22 cm (15 x 13 x 5.6 ″ inch)
  • Weight 8.6 pounds
  • Social media sharing
  • The posture lock function holds the ROV at the set angle within ± 0.1 ° tilt and roll
  • Connectivity 100m cable connection

Geneinno underwater drone with robotic arm

  • 4K UHD camera
  • 30fps 1080p video
  • 160 ° wide angle lens
  • CMOS image sensor
  • Color filter red and purple
  • 32 / 64G storage
  • 6 engines (4 vertical + 2 horizontal)
  • Achieve a 360 ° position control
  • Built-in posture sensor
  • Depth up to 150 m
  • Cable length 150m
  • Lights 2 x 1500 lumens
  • The customizable interface enables add-ons such as the robotic arm hydrophone and sonar for different purposes (not included).
  • 9000mAh battery
  • Live video feed to your phone or tablet via a wireless transmitter

JFF mini underwater drone ROV

  • Dimensions: 385 × 226 × 138 mm (15 "x 8.9" x 5.4 ")
  • Weight: <2.5 kg
  • Maximum depth: 100 m
  • Maximum speed: 4 knots (2 m / s) 7 km / h
  • Adjustable tilt lock and depth lock ± 45 °
  • Endurance: 2 hours (low speed forward) 1.5 hours (medium speed forward) 40 minutes (high speed forward)
  • Underwater VR and live streaming supported
  • Live media on up to 3 wireless devices
  • HDMI connection
  • 2 LED lights with 1200 lumens each
  • LED brightness can be adjusted with the remote control
  • Battery cycle times:> 300 times
  • CMOS: 1 / 2.3 in
  • Aperture: F3.0
  • Focal length: 4.0 mm
  • ISO range: 100-3200
  • Field of view: 95 °
  • Maximum photo resolution: 12M (4000 * 3000)
  • Photo format: JPEG / DNG
  • Video resolution:
  • FHD: 1920 * 1080 30fps
  • FHD: 1920 * 1080 60 Fps
  • FHD: 1920 * 1080 120 Fps
  • FHD: 3840 * 2160 (4K) 30 fps
  • Maximum video stream: 60 million
  • Video format: MP4
  • Memory card capacity: 64G

Additional equipment for underwater drones

BESTSUN UV diving lamp

  • 395-400nm UV light. Waterproof for 100m underwater. Ideal for diving.
  • The UV diving lamp burner is supplied with a magnetic control switch and the brightness can be continuously adjusted.
  • Powered by 2x 18650 batteries. Battery and charger included. Complete set for diving.
  • Robust housing made of aluminum alloy with powerful 5 x XPE-LED. Solid and durable enough to last a long time
  • Perfect diving torch for detecting objects that cannot be seen with the naked eye. e.g. searching for amber and minerals, uncovering dried pet urine stains, hunting for scorpions, recognizing fluorescence, money, ID cards, passports, etc.


  • Coiled Lanyard Expands to 36 ″ (91.4 cm)
  • Corrosion Resistant Spring
  • Loaded Gate Clip Gate Clip has 360 Degree Swivel
  • Lanyard and Split Ring
  • Attachment Split Ring: Corrosion Resistant Stainless Steel

Stainless steel double carabiner - size selectable, multifunctional and practical double snap hook

  • Multi-functional & light
  • Marine stainless steel material
  • Corrosion-resistant construction
  • Developed for underwater diving use
  • Large boat lines for attachment

ANSMANN battery charger for AA / AAA / C / D NiMH batteries & Li-Ion 18650/26650 battery charger (charging / discharging / testing)

  • INTELLIGENT battery charger charges fully automatically and stops when the inserted batteries are fully charged. The trickle charge keeps the battery charge at 100%, so the batteries are always ready for use and can remain in the charging station
  • COMPATIBLE with up to four NiMH batteries of sizes AA / Mignon / HR6, AAA / Micro / HR03, C / Baby / HR14, D / Mono / HR20 or four Li-Ion batteries, sizes 10400 to 32700 (e.g. also 18650 and 26650) | 2-in-1 battery charger: smartphone and power bank can be charged via USB
  • FEATURES: Selectable charging program and charging current - independent of each charging slot. Charge indicator with battery voltage (V), charge / discharge current (mA), capacity (mAh), charging time (h)
  • SECURITY for batteries and battery care station through reverse polarity protection | Automatic shutdown -dU | Overcharge protection | Single shaft monitoring | Safety timer | Detection of defective battery cells
  • CHARGING TIME (depending on the selected charging current): For NiMH 1000mAh = approx. 0: 40-2: 30h | NiMH 2500mAh = approx. 1: 30h-6h | Li-Ion 1000mAh = 0: 30-2h (selectable output: 4x 500 / 1000mA, 3x 1500mA or 2x 2000mA | USB connection: 5V / 1000mA)
  • DEEPLY DISCHARGED batteries are also charged (NiMH from 0.2V / Li-Ion from 2V) and do not have to be disposed of as "defective", but can be used for a little longer

Additional equipment for ROV's and night dives

Compartments underwater signal light night dive marker

  • Location Signal Light - It's ideal for keeping an eye on the location of your partners during a night dive or when exploring dark areas of the marine life during the day. Ideal for hanging on scuba tanks or BCD for easy and clear localization and identification during the dive.
  • Rotary Switches & Multipurpose Switches - With a rotary on / off switch on the head, very easy to use. Tighten the head to turn the light on and unscrew the head to turn it off. This lighting device is a firefly LED signal light for safe diving. Can also be used for jogging, camping, fishing, kayaking, ravening, night group outing, team day, family walking.
  • Compact design and excellent waterproof performance - Size: 0.87 "diameter x 2.32", net weight is only 16g. The appearance of the signal light is inspired by the torpedo, it is a cute diving signal light. With high quality waterproof O-ring, can be used 200m underwater. Add a string for easy attachment to diving equipment
  • Long runtime and battery included - Powered by 3 x LR44 batteries that offer a long burn time of approx. 200 hours.

LED signal light night diving

  • The "Marker Beam" from Mares combines the advantages of a light stick with a lamp. The compact LED lamp "Twin Beam"
  • With a turn of the lamp base, Twin Beam is switched on and generates an ultra-bright light beam with over 5 500 Kelvin
  • More than enough light for a back-up lamp that can be easily stowed on the jacket or in the smallest pocket

This was ours List of the best underwater drones and ROVs for 2021! I hope you enjoyed it, if so, and you don't want to miss any of my next equipment guides, sign up for the newsletter here.

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