PADI Enriched Air Nitrox Course


Dive for longer and be back in the water sooner with enriched air, also known as Nitrox. This popular PADI specialty course will teach you how to use Nitrox safely and enjoy its many benefits.

You can complete your PADI Enriched Air (Nitrox) course on board our Cairns-based overnight vessel OceanQuest.

What is Nitrox?

Nitrox is a mixed gas of Oxygen Enriched Air between 23% oxygen and 40% oxygen. The air we breathe is approximately 20% oxygen and 80% nitrogen.

During diving, water pressure causes the nitrogen we breathe to be absorbed into the bloodstream. The higher the pressure, the more nitrogen is absorbed, and the greater the risk of decompression illness. The higher the oxygen percentage in your air tanks, the less nitrogen we absorb, leading to a longer no-decompression limit and a longer dive time.

Advantages of Nitrox

  • Longer no stop times: extend your bottom time and increase your safety margin
  • Reduced post-diving fatigue: your body has less residual nitrogen to get rid of after your dives

PADI Nitrox Course schedule

There are two sections to this course. You can complete the academic portion via PADI eLearning before your trip. This online learning covers all the enriched air diver course content and allows you to study at your own pace through an easy-to-use, interactive program. You’ll also have access to an online version of the Enriched Air Diver Manual.

Alternatively, take the whole course on board OceanQuest on your Great Barrier Reef liveaboard trip and complete the learning, knowledge review and exam while you’re on board.

You’ll learn how to manage your oxygen exposure, set your dive computer for Nitrox diving and analyse the gas contents of your tank.


On board our liveaboard vessel OceanQuest


1 or 2-night overnight trip

Course Outline:

Academic portion (completed via eLearning or on board) and two practical dives


  • All required PADI materials
  • Nitrox fills
  • All dive and snorkel equipment, and full tuition
  • Fresh chilled water, tea and coffee
  • Two outer reef locations per day

Book now

Nitrox Course add-on

Course only - overnight trip additional
Per person

PADI Enriched Air (Nitrox) eLearning Course

Cost per person
$262 + tax
Online only Paid directly to PADI

​Includes all equipment and tuition. Prices valid to 31 March 2025. Price is per person and includes all applicable fees, taxes and levies. Locals discount not valid for optional extras.

Additional info

Prerequisites and forms



  • Snacks and beverages
  • Photo purchases
  • Digital camera hire
  • Quality souvenirs

What to bring

  • Hat, sunglasses and sunscreen
  • Swimsuit and towel
  • Cert card and logbook

Medical and altitude information

All scuba participants must meet medical questionnaire requirements. Some conditions or medications may prevent you from diving.

Queensland’s code of practice on diving states that for a single no decompression dive, you should not fly/go to altitude for at least 12 hours, or 24 hours if divers have had multiple dives per day for several consecutive days, or have made dives that require decompression stops.

Altitude is defined as 300m/1000ft above sea level. This includes going to the Atherton Tablelands (a popular local scenic attraction), so please be aware if booking tours to follow your dive trip. Under normal circumstances, you should be out of the water from your last dive of the day at 2 pm.