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UWATEC Galileo Luna - High-Tech Dive Computer That Shows Us Different Reality In Diving

UWATEC Galileo Luna - High-Tech Dive Computer That Shows Us Different Reality In Diving

UWATEC Galileo Luna is unique and versatile dive instrument – hoseless air-integration, large monochromic display, huge on-unit memory capacity, possibility to upload grey-scale pictures, integrated digital compass, infrared port for PC interface, possibility to upgrade firmware to Galileo SOL version... It is recommended dive computer to those people who are serious about diving!

General Information
User Interface
Your Review



UWATEC Galileo Luna is one of the most sophisticated and thorough dive computers in nowadays scubadiving market. And I may say that it is a light version of Galileo SOL.

Galileo Luna can satisfy all our diving needs – beginners will find all functions they need to start diving career and well written explanations (quite big volume of info though!), advanced divers will appreciate flexibility of usage in different diving conditions and possibility to download Predictive Multi-Gas (PMG) and Heart Rate Monitoring firmware update and on top of that Apnea upgrade can be downloaded free of charge. When you get that – your Luna will be as functional as Galileo SOL.

Along with Microbubble Suppression function, UWATEC supplied Galileo Luna with another feature for our extra-safety – Profile Dependent Intermediate Stops (PDIS) and not to mention functions, which made Luna unique and versatile dive instrument.

Some of them mentioned below:

  1. hoseless air-integration;
  2. large monochromic display;
  3. huge on-unit memory capacity;
  4. possibility to download to view grey-scale pictures;
  5. integrated digital compass;
  6. infrared port for PC interface;
  7. possibility to upgrade firmware to Galileo SOL version


UWATEC Galileo Luna Features Card Copy this UWATEC Galileo Luna Features & Alarms Card for your Reference and Share with your friends and buddies!


  • you will be the owner of one of the most sophisticated dive computers in our market;
  • you will get instrument that has high level of customization of its unique functions;
  • you will be able to use UWATEC Galileo Luna as a freediving and multigas computer after upgrading firmware;
  • you will have dive computer with wireless air integration for 1 transmitter;
  • you will be able to dive down to 330 meters with Galileo Luna;
  • you will be able to download up to 100 grey-scale pictures and view them underwater and on surface;
  • you will be able to replace battery yourself and keep settings safe with data retention feature








User Interface
3 buttons
Dive Modes
Air, Nitrox, Gauge, FREEdive (after upgrading firmware)
Integrated Digital Compass
Number of Gas Mixes
Air, 21% - 100%
1.2 - 1.6 bar
Air Integration
Safety Stop (SS)
Deep Stop (DS)
Conservative Factor
MB (microbubble) settings – L0, L1 – L5
Altitude adjustment
Gas Switching
Dive Planner
planning No-DECO & DECO dives
Logbook Capacity
100 dive hrs with 4 sec sampling rate
Max Operational Depth
330 meters
Backlight duration
2 – 12 sec
Sampling Rate
4 sec
User Replaceable Battery
Data Retention
PC Interface
2 years










With all its deep functionality and variety of features Galileo Luna has only 3 control buttons.

You may adjust display layout according to your needs. Display has 3 types of configuration:

  1. light;
  2. classic;
  3. full data display


If it is set as Light screen configuration – dive computer will show only critical bigger sized dive values that are sufficient for mode you are in; Classic display has more information shown and Full configuration displays all data plus many extras.

You may dive with Light screen configuration only in No-Decompression conditions, if you entered Decompression or MB Level stop – display will automatically swap to Classic in order to show you all information related to those specific conditions.

And each configuration has main and alternative displays – so you need to press ‘middle’ button to see more dive data.


Galileo Luna has 2 bar graphs: Nitrogen Loading Bar Graph (this one is shared between Nitrogen Loading and Ascent Rate and it replaced by Ascent Rate Bar Graph during ascent) and Oxygen Toxicity Bar Graph that is shared with Tank Pressure Bar Graph. Brief descriptions of them you will find below:

  1. Nitrogen Loading Bar Graph shows graphically nitrogen intake by adding and subtracting segments, if you have full set of segments – No-Decompression dive becomes Decompression dive;
  2. Oxygen Toxicity Bar Graph is a graphical representation of oxygen toxicity level and it works the same – adding and subtracting segments – with full bar you will get a High O2 alarm;
  3. Ascent Rate Bar Graph – graphically shows how fast your ascent is


Before setting up parameters and going underwater we, guys, need to devote quite a time to read manuals and learn how to use dive computer correctly. Because it is high-tech dive instrument and it is not easy to jump on it straight away – too much information and procedures to learn!







At this stage we will look at the customizable functions and set our Galileo Luna for dive. So, after we got to the Main menu we will be able access following sub-menus and customize Luna as much as we want:

  1. FO2 – Air, 21% - 100%;
  2. Dive parameters: MB Level – L0, L1 – L5; Safety Stop Timer; PO2 – 1.2 – 1.6 bar; Desaturation Reset option; Profile – Dependent Intermediate Stops (PDIS) – ON/OFF, etc.
  3. Warning settings – this sub-menu allows to turn ON/OFF warning messages individually (but alarms can not be silenced or turned off!);
  4. Digital Compass;
  5. Altimeter;
  6. Clock parameters: time format and time; alarm and date, etc.
  7. Utilities: IrDA speed, backlight duration, gas integration, etc.
  8. Personalization settings: configure display, language, workload estimation - Respiration, etc.
  9. Dive Planner – allows us to plan No-Decompression and Decompression dives;
  10. Logbook – view our previous dives;
  11. Pictures viewing and uploading from PC via optional IrDA interface and SmartTrak software


After we have finished customizing, we may go to Dive Planner. Dive Planner of Galileo Luna allows us to see not only No-Decompression times available and plan No-Decompression dives, it also make it possible to plan Decompression dives too.

Planning our next dive is based on many crucial factors, like selected FO2 and MB Level, water temperature and altitude, residual nitrogen and workload.

For No-Decompression dive we enter desirable depth and Galileo will calculate corresponding No-Decompression (No-Stop) time at this depth.

For planning Decompression dive we need to enter bottom time and Luna will show appropriate decompression data – deepest stop depth and time and total ascent time, according to critical factors mentioned above.







UWATEC Galileo Luna: Diving With Air & Nitrox

Before actual diving it is worth to say about Microbubble (MB) Level Stops and Profile – Dependent Intermediate Stops (PDIS).

Galileo Luna has few levels of MB adjustment and first of all, you may set MB Level from L0 to L5 and PDIS can be set to ON/OFF. Microbubbles (MB) will build inside human body during any dive and even doing Decompression and Safety stops won’t prevent them from developing. MB Suppression mathematical model monitors diving conditions by gathering dive data and adds additional safety for diver by prompting additional stops during a dive.

According to this, you should set certain level of MB suppression – from Level 1 (lowest protection) to Level 5 (highest protection) – by setting them you tell the dive computer to prompt you for Level Stops on your way up. Level L0 is just the very basis of ZHL – 8 ADT MB PDIS algorithm.

During a dive, depending on dive time, depth, MB Level you set before and some other factors, Galileo Luna will give you several prompts to perform additional level stops (for microbubbles suppression). It will assure diver, that after resurfacing, he/she will have the lowest possible level of microbubbles in his/her body.

Profile – Dependent Intermediate Stops (PDIS) algorithm tracks your dive profile and monitors nitrogen intake and according to the diving conditions gives you intermediate stop prompt. On the contrary - widely used Deep Stops do not take into the consideration diving profile and give you stop time at half of the maximum depth achieved during a dive.

After a bit of theory we are well prepared to practice everything we learnt!

Upon starting a dive Galileo Luna begins showing us appropriate dive data and the amount of it depends on type of display layout you set before – Light, Classic, or Full.

Display itself is very big and shows variety of information. If someone used dive watch computer style instruments – one will be pleasantly surprised of how much useful data is shown simultaneously!


UWATEC Galileo Luna NO-DECO Card

Copy this UWATEC Galileo Luna NO-DECO Card for your Reference and Share with your friends and buddies!


Also Galileo Luna may wake you up by means of warning and alarms, like Fast Ascent Rate, High PO2 and O2 alarms, Low tank Pressure and Low Remaining Bottom Time warnings, etc. For all of those conditions Luna has designated data and it is shown to us in clear and intuitive format – no any doubts about that!


When we exceed No-Decompression limits (NDLs), Galileo Luna activates Decompression mode and all dive data calculated according to Decompression dive.

At this case dive computer gives you warning that No-Decompression dive became Decompression dive by audio and by inverting colour of the background of that part of display where it shows Deepest Decompression Stop depth, Decompression Stop Time and Total Ascent Time. Also you will get full set of segments on Nitrogen Loading Bar Graph.

If you set MB Level higher than L0 (this setting doesn’t require ‘level stops’), you will be prompted to complete few ‘level stops’ no matter whether you are in No-Decompression mode or in Decompression mode.

For MB Level Stop Galileo Luna has specific display:

  1. level depth;
  2. level countdown timer;
  3. Total Ascent Time;
  4. corresponding icons and notations


If diver omitted ‘level stop’ – Galileo Luna will automatically adjust preset MB Level to lower one and if you dive deeper after that, dive computer may give you a request straight away to complete ‘level stop’ to reduce the risk of microbubbles formation.


UWATEC Galileo Luna: Diving In GAUGE Mode

In Gauge mode dive computer doesn’t perform any decompression and MB calculations. You will be able to use it as a depth gauge and timer only.

Display layout looks as follows:

  1. current, average, and maximum depths;
  2. Elapsed Dive Time (EDT);
  3. tank pressure;
  4. temperature;
  5. time of the day;
  6. ascent speed value (while ascending)


You will be able to use Stopwatch functions, make a Bookmark and use a compass as well.

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Galileo Luna has following functions for post diving operations:

  1. Picture viewing that stored in on-unit memory;
  2. Logbook and Dive Statistic (History) viewing and downloading to PC via IrDA unit;
  3. Dive Planning;
  4. Upgrading the firmware;
  5. Changing settings of dive computer via SmartTrak Software


One of the nicest features of Galileo Luna is possibility to upload from PC and view grey-scale pictures on this dive computer! Of course it doesn’t have full colour capabilities as we have in Mares Icon HD model, but still very useful when downloading bitmap maps of diving places or decompression tables.

Galileo Luna has very extensive on-unit memory capacity – it may store about 100 dive hours with 4 seconds sampling rate of recording and has 5 pages of dive data. You may easy download all data to PC using optional IrDA unit – it doesn’t cost too much, so I recon it is a must have thing!

And there is no Logbook data or nitrogen or oxygen calculations lost during battery replacement!

Also it is possible to upgrade firmware of Galileo Luna. At this moment UWATEC has following firmware upgrades on offer:

  1. Predictive Multi-Gas (PMG) – possibility to use Luna with 3 Nitrox gas mixes;
  2. Heart Rate Monitoring – possibility to use Luna with heart monitor and Real Workload calculations for extra-safety;
  3. Free of charge Apnea upgrade – possibility to use Luna for freediving

And by using SmartTrak Software you may change settings on your dive computer – just input desirable parameters into SmartTrak that is installed on your PC and then upload them to Galileo Luna – easy as it is!







UWATEC Galileo Luna: What Divers Say


  • simple to program and easy to read dive computer;
  • the best and easiest computer to use;
  • full dive log with profile graph, huge dot matrix display;
  • recommended dive computer for the experienced divers and bold beginners



  • be prepared to invest in lots of straps, as original strap may get cracked too soon...


No any complains about its operations, just big amount of information in manuals – but, hey, it is high-tech scuba diving equipment and we need to learn it to make it really our ‘buddy’!

And another thing is worth to say about – absence of Dive Simulator in Galileo Luna. My personal opinion is that dive computers of this class must have this function – it will make quicker learning process and familiarizing new users with Luna and also let guys who own this dive instrument to recall its functions and behaviors if they don’t dive for a while!

Precise dive data and oversized digits, clear warning messages, extra–safety for diving in any conditions and profiles, possibility to upload pictures and huge on-unit memory capacity, air-integration and digital compass on top of everything else plus possibility of firmware upgrade – what else do we need in dive computer these days!


UWATEC Galileo Luna dive computer
UWATEC Galileo Luna

Dive-Computer-Wizard Rating
golden star golden star golden star golden star golden star


If you are serious about diving and love high-tech stuff, if your family budget allows you to spend quite a bit money without having a kick from your family members (or maybe if you can withstand few kicks!) – UWATEC Galileo Luna is definitely for you! After having this beauty – you won’t need another dive computer ever (of course, if you don’t plan to dive with trimix soon enough – because Luna doesn’t have trimix capabilities even with firmware upgrade)!



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Bobby, 19 October 2012 13:48
Complete Set Of Functions After Galileo Luna Upgrade Made It Perfect For Diving In Challenging Conditions!

I have been diving with Galileo Luna for about a year in a wide range of temperatures - from East Coast of United Kingdom near Aberdeen to Tavua Bay in Fiji. Dive computer performs perfectly in any condition!

Before doing firmware upgrade I was concerned about future possible glitches, but everything went and worked smoothly and now I have my Luna with equal potential to Galileo SOL.

I really wanted to test heart rate monitoring in cold conditions and how it would calculate my workload and decompression. I think that this option is excellent extra-safety feature in addition to what Luna already has, especially if I dive in cold waters and with decompression dives.

Wireless is perfect as well, display - just amazing how much information I may get. Dive data is easily readable and understandable and backlight is strong - no any problems to read display even in muddy water!

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