What is the ENOS diver rescue system?

ENOS is a GPS-based diver location and rescue system that helps a boat crew locate a surfaced diver who has drifted out of sight. The diver carries an ENOS transmitter, which sends the diver's GPS position by radio to the ENOS receiver on the vessel once it reaches the surface. The receiver displays the diver's distance and heading from the boat. ENOS has been in service since 2004 and is used by dive centres, liveaboards, coast guards, and military units in over 35 countries.

How far away can ENOS find a diver?

ENOS can locate a diver from up to 10 kilometres (5.6 nautical miles), depending on the height of the receiving antenna. A higher antenna can provide greater range. Because the diver's actual GPS coordinates are transmitted rather than a signal bearing, the position remains accurate at any distance within radio range.

How deep can the ENOS transmitter go?

The ENOS ETX transmitter is pressure tight to 100 metres (330 feet), making it suitable for recreational and technical diving profiles. It can be activated underwater and sent to the surface attached to a surface marker buoy if a diver needs assistance during a dive. Transmission occurs once the transmitter reaches the surface because GPS and radio signals require the transmitter to be above water.

Which ENOS receiver should I choose, ERX-I, ERX I BT or ERX-P?

The ERX-I is a portable receiver with built-in GPS and radio antennas, plus a socket for an external GPS antenna, allowing it to be used from inside a wheelhouse or saloon. The ERX-P is the permanently installed version designed for a helm station. The ERX I BT is a portable receiver with an indoor GPS option.

How do I buy an ENOS system?

You can order an ENOS system directly from the ENOS collection, which includes receivers, transmitters, and accessories with current pricing and stock information. Dive centres, liveaboards, and fleets fitting out multiple boats or ordering transmitters in quantity can contact info@nrc-international.com for a formal quotation and volume pricing.

ENOS® Diver Rescue & Location System

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NRC ENOS emergency notification oxygen supply system

One Click. Immediate rescue.

Never Lose A Diver

Trusted by dive boats, resorts, and military units worldwide, ENOS delivers real-time diver tracking and instant emergency alerts. Designed for reliability in critical situations, it ensures fast, accurate response when every second counts.

How ENOS Works?

NRC ENOS rescue system – how it works, step 1

Receiver Gets GPS Fix

The vessel’s ENOS receiver captures its own GPS position as the baseline

NRC ENOS rescue system – how it works, step 2

Diver Activates Beacon

Upon surfacing, the diver presses the transmitter, no satellites or SIM needed. The GPS data is sent instantly via VHF radio

NRC ENOS rescue system – how it works, step 3

Accurate Diver Location

The diver’s GPS location, distance, and heading are displayed onboard, enabling swift, life‑saving response

Unlike Others

Service‑Free Operation

No subscriptions, software updates, or SIM cards required

Field‑Tested Reliability

Trusted by NATO, rescue teams, and professional operators

Precise Rescue Guidance

Shows exact distance and direction, not just coordinates

Multi‑Language Interface

English, German, French, and more

Zero Setup for Divers

No pairing, no activation, just press and rescue

Testimonials

4.5 Out of 5 Stars from Over 325 Reviews

“Our boys would’ve gone unseen – thanks to ENOS, the boat reached us in minutes. Without it,we would’ve stood no chance.”

Nadine + Yousef A., Hamata Mangroves

“Without ENOS, no one would’ve seen me. It made my rescue possible – I had already drifted824 meters!”

Noemi M., VDST Diver, diving since 1995

“ENOS is unbeatable under pressure – easy to use, long range, instant rescue. No other system gives me this level of safety.”

Cici N., Seawolf Safari

“Our buoys were barely visible – only ENOS made rescue possible. The boat changed course instantly and brought everyone back safely.”

Monika H., Omneia Diving & Travel

List of ENOS members

Australia

Eye to Eye Marine Encounters
Great Barrier Reef Legacy

Ecuador/Galapagos

Galapagos Aggressor III

Egypt/Red Sea

M/Y Blue
M/Y Destiny
M/Y Emperor Elite
M/Y Esther
M/Y Galaxy 720
M/Y Ghazala Explorer
M/Y Independence II
M/Y Independence III
M/Y Longimanus
M/Y Red Sea Adventurer
M/Y Red Sea Explorer
M/Y Admira
M/Y Sea Friend
M/Y Seawolf DOMINATOR
M/Y Seawolf SOUL
M/Y Seawolf STEEL
M/Y SS Excellence
M/Y SS Grand
M/Y SS Glorious Miss Nouran
M/Y Soul of Omneia
M/Y Spirit of Omneia
M/Y Thunderbird

Indonesia

MSV Amira
MSV Cheng Ho
MSV Hatiku
MSV Neomi
MSV Raja Ampat Explorer
MSV Sea Safari VI
MSV Sea Safari VII
MSV Tarata
MSV Temu Kira
MSV Tiaré
M/Y Blue Pearl

Maldives

Dive Point Meedhupparu
Dive Point Rannalhi
SHAMAR Guesthouse & Dive
M/Y Blue Force 1
M/Y Blue Force 3
M/Y Eco Blue
M/V Nautilus TWO
M/Y Theia
M/Y Sub Oceanic - Le Meridien
M/Y Carina
M/Y White Pearl

Lithuania

BSHRP, Baltic Sea Heritage Project

Mauritius

Dive Sail Travel
S/C Valérie

The Netherlands

Scuba Republic

Sudan

M/Y Seawolf DOMINATOR
M/Y Spirit of Omneia

Thailand

Dive Ventures

Seychelles

S/C King Bambo
S/C Valérie

South Africa

African Dive Adventures

Philippines

Easy Diving Sipalay

U.S.A

Lauderdale Divers

Palau

M/Y Black Pearl

The ENOS Advantage

The No.1 Rescue System for Divers Worldwide

NRC ENOS system advantage – key benefit 1

ENOS and MOBOS have safely located lost or drifting divers for over two decades. Trusted globally since 2004, the system provides electronic emergency calls and precise GPS positioning, even in strong currents or challenging conditions.

Safety On and In The Water

NRC ENOS system advantage – key benefit 2

The ENOS system enables instant, onboard rescue from your own boat without needing SAR teams, emergency frequencies, or special licenses. It operates independently of GMDSS (Global Maritime Distress Safety System), with no subscriptions or radio certifications (SRC) required.

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FAQs about ENOS

What dive centres, liveaboards and safety officers ask before putting ENOS on board.

ENOS is a GPS-based diver location and rescue system that lets a boat crew find a surfaced diver who has drifted out of sight. The diver carries an ENOS transmitter; once it reaches the surface, it sends its GPS position by radio to the ENOS receiver on the vessel, which displays the diver's exact distance and heading from the boat. It has been in service since 2004 and is used by dive centres, liveaboards, coast guards and military units in over 35 countries.