This website use cookies and similar technologies to improve the site and to provide customised content and advertising. By using this site, you agree to this use. To learn more, including how to change your cookie settings, please view our Cookie Policy
Pocketmags Digital Magazines
GB
Pocketmags Digital Magazines
   You are currently viewing the United Kingdom version of the site.
Would you like to switch to your local site?
Digital Subscriptions >  Latest Articles > DIVER TESTS - Ratio iDive Easy dive computer

DIVER TESTS - Ratio iDive Easy dive computer
DIVER

DIVER TESTS - Ratio iDive Easy dive computer

Posted 21 March 2016   |   9713 views   |   Sport   |   Comments (0) NIGEL WADE tests a new dive-computer with everything but bells and whistles

WHAT DO WE EXPECT FROM A DIVE COMPUTER? I know what I want, and that’s a tool to let me know what my current depth is, how deep I’ve been, how long I’ve been down and, most importantly, how long I can stay under water without any deco penalties. 
Every modern dive computer does exactly that, but some models offer more, much more. The iDive Easy computer from Italian designer Ratio is being distributed in the UK by Liquid Sports and has more functions than I could wag a stick at, as I found out during a dive trip to the island of Mauritius. 

The Hardware
The iDive Easy is a wristwatch-style instrument with a 47mm-diameter x 16mm deep polished 316L stainless-steel case and a scratch-resistant sapphire crystal glass face. This solid case gives the computer a depth-rating of 220m. 
The 40mm-diameter 80 x 80-pixel matrix LCD backlit display has oversized graphics. Menus and functions are accessed via three of four spring-loaded buttons at the 2, 4, and 8 o’clock positions, while the button at 10 o’clock activates the backlight. 
A single long-life USB rechargeable battery similar to those used in smartphones and tablets powers the iDive range. Charging is done via a USB interface cable with gold-plated terminals that bayonet into the iDive’s connection terminal. 
The computer has an automatic sleep mode. The display is switched off if the iDive is still for five minutes, which allows for claimed battery burntimes of up to 25 hours in Dive mode, two months in Watch mode and up to six months in Total Sleep mode. As soon as the sensor detects movement, the display is switched on. 
The strap is a heavy-duty silicon buckled version supplied with a separate extension for use over bulky exposure suits. The iDive Easy is available in eight colour schemes, and a Sea Jewel version with Swarovski crystals set around the periphery of the face is also available. 
A dedicated nitrox analyser can be added for the entire range of Ratio multi-gas computers. This simply connects via the bayonet charging port and automatically calibrates and validates its oxygen sensor. You’ll have to manually set the analysed mix into the computer, however, as current Health & Safety rules don’t allow this to be done automatically.

The Algorithm
The Easy model is a two-mix air/nitrox computer employing a real-time Buhlmann ZHL-16B algorithm to calculate tissue-saturation status and accurately and safely formulate repetitive dive-profiles. Safety-stop depths can be user-set, as can the choice of deep stops in a customisable menu system. 
Modes & Functions
The iDive Easy has Air, Nitrox, Freedive, Gauge, Planning and Logbook modes, standard fare on nearly every available timepiece-style dive-computer, as are Watch and Chronometer modes. However, this dive instrument offers a further array of functions, which include a 3D self-compensating compass, an altimeter with automatic compensation for altitude diving, a thermometer and a barometric pressure gauge. 
Again, these functions aren’t unique in the dive-computer world but the iDive range goes beyond that and includes a current moon phase mode in which full, new, waxing and waning phases of the moon can be predicted. 
Then there’s a pitch & roll function indicated on both a vertical and horizontal axis and, for the diver who has everything, a magnetometer to help out if you’re looking for something big and made of iron. 
For the fitness enthusiasts among us there’s also a pedometer to record steps, mileage and burned calories during those early-morning jogging sessions.

In Use
I dived with this instrument on an intensive seven-day itinerary and, as is usual practice with computer tests, I also took my own tried and trusted model to add a safety net should things not go according to plan. 
After taking time to digest the downloaded PDF instruction manual (as best I could) and a simple, short charging process using my iPhone wall-charger, I delved into the menus to set personal parameters such as safety-stop depths, alarms and gradient factors. 
I then set the contrast and brightness of the backlight and set it to stay on for its maximum duration of 30 seconds, in the knowledge that the battery could be recharged after each day’s diving. 
The menus were accessed with single pushes of three buttons. They’re stiff and left me with sore fingers, but have the advantage of being almost impossible to activate accidentally. 
Donning the computer for the first dive, I noticed that the strap was shorter than other models I’ve used, which meant that without the extension strap I had to roll up my wetsuit sleeve and attach the computer around my bare wrist. 
My wrists (unlike my belly) are skinny, so this was a surprise, and something chunkier divers might need to take into account. 
Under water, the display was easy to read. The crisp LCD matrix had great contrast (especially when backlit) and is set out in such a way as to make assimilating the information shown 
very easy. 
The important stuff such as present depth and no-deco limits are displayed using big and bold fonts with the maximum depth, oxygen percentage or ambient temperature in smaller fonts. Safety-stop information when displayed was counted down in minutes and was instantly recognisable. 
I tried a variety of the functions including the compass. Its display was a delight to use, showing the direction not only as large N, S, E and W letters but also in degrees. 
I also used the moon-phase utility, a “nice to have” function for calculating the likelihood of clownfish and other marine species having recently laid eggs during a full moon.
I also used the pitch & roll feature to assess my orientation under water accurately (something I’m sure disciplined GUE technical divers would find useful). 
Unfortunately nitrox isn’t readily available in Mauritius, so I couldn’t check out the gas modes or use the dedicated Ratio O2 analyser.
Summary
This little wristwatch-sized dive computer did exactly what I expected it to do, in a no-fuss, logical manner.  The standard functions can be found on virtually all of the dozens of dive instruments on the market. 
In my mind it’s the rechargeable battery that makes the Ratio iDive stand out from the crowd. This was apparent as my own model gave me the dreaded “Low Battery” warning a few dives into this trip, meaning that I would have to go through the inconvenience of packing it up, queuing at the Post Office and spending some money to put it right.
I did find some of the unique extras on the iDive Easy useful. No, as expected, I didn’t use the pedometer, but I did use the moon phase and pitch & roll functions along with the compass. 
Although I didn’t get to use it, I think the addition of the dedicated O2 analyser is genius. No longer would I have to queue to use the dive centre’s well-used analyser to verify my gas mix and, unless anyone else had a Ratio, I wouldn’t have to share mine either. 
I don’t think I’ll ever need a magnetometer. Big iron-hulled wrecks are normally easy to find – but it would give me the bragging rights down the boozer.

SPECS
PRICE - (as at 21 Janaury 2016) ?375. O2 analyser ?200 
TYPE - Wristwatch, air and nitrox options 
SIZE - 47mm dia x 16mm
WEIGHT - 140g 
DEPTH-RATING - 220m
ALGORITHM - Buhlmann ZHL-16B
GAS SWITCHING - No
DIVE MODES - Air, Nitrox, Freedive, Gauge
FUNCTIONS - Watch, chronometer, compass, barometer, altimeter, pitch & roll, moon phase, magnetometer, pedometer
COLOUR OPTIONS - Black, white, yellow, blue, red, turquoise, purple, orange
DIVER GUIDE - 9 out of 10

For more great articles like this get the MARCH 2016 issue of DIVER below or subscribe and save.

Single Issue - AUGUST 2018 Replica Edition included
£2.99
Or 299 points
Annual Digital Subscription
Only £ 1.67 per issue
SAVE
44%
£19.99
Or 1999 points
6 Month Digital Subscription
Only £ 2.00 per issue
SAVE
33%
£11.99
Or 1199 points
Monthly Digital Subscription
Only £ 1.99 per issue
SAVE
33%
£1.99
Or 199 points

View Issues

About DIVER

DIVER is Britain's best-selling scuba diving magazine – regularly out-performing all its competitors combined on the open market.

More great content like this...

For more great articles like this subscribe to DIVER today.

Most read articles this month


ALEX HILDRED: MARY ROSE DIVER

ALEX HILDRED: MARY ROSE DIVER

When she took up scuba 40 years ago, Alexandra Hildred had no idea that her life would become inextricably linked with a Tudor warship. Now the Mary Rose Trust’s Head of Research and Curator of Ordnance & Human Remains, she tells STEVE WEINMAN about the lead-up to the raising of the iconic wreck, still one of the biggest such operations ever attempted. More...
WHEN THE MUSE GOES MISSING!

WHEN THE MUSE GOES MISSING!

Nashville songwriter Mark Cawley shares some tactics for reviving those elusive creative juices when you’ve lost the flow More...
The 5 Best Photography Magazines

The 5 Best Photography Magazines

Here at pocketmags.com, we have the 5 best photography magazines to inspire and inform your skills and get you snapping away with your beloved camera of choice! More...
5 Digital Magazines for Spring

5 Digital Magazines for Spring

Here at Pocketmags, we simply cannot wait to welcome in a new season of bloom and blossom. Jumpstart your motivation with our selection of 5 digital magazines for spring. More...
The 5 Best Arts & Crafts Magazines

The 5 Best Arts & Crafts Magazines

From the early days of digging our hands into playdough and getting messy with paper mache, to growing up and learning how to meticulously operate a needle and thread for the very first time, we will always have the wonderful movement of arts and crafts to thank for these simple pleasures of life. More...
The 5 Best Gardening Magazines

The 5 Best Gardening Magazines

It’s time to literally stop and smell the roses and grow a patch of paradise that you can not only enjoy but also, be the proud owner of. Give the birds and butterflies a reason to mingle amongst the tulips and a chance for your garden to be the best it can be. More...
New to Pocketmags: True Crime Library

New to Pocketmags: True Crime Library

Pocketmags is eager to announce the adoption of a range of new and thrilling titles - ones that are sure to fascinate or spook you to your core - we introduce you to, True Crime Library. More...
The 5 Best Caravan & Motorhome Magazines

The 5 Best Caravan & Motorhome Magazines

Get ready to pack your things and go - it’s time to hit the road Jack! Put the pedal to the metal and ride the route until the sun goes down - after all, it’s about the journey, not the destination. More...
Who Will Get Your Nomination? Total Film or Empire

Who Will Get Your Nomination? Total Film or Empire

Pocketmags is celebrating another year of incredible filmmaking by reflecting on two of our top selling digital film magazines, Total Film magazine and Empire magazine. More...
The 5 Best Food Magazines

The 5 Best Food Magazines

Our trusty list of the 5 best food magazines will help to inspire your inner chef and create the everyday meals you can start getting excited about. More...
Vouchers Gift Cards A magazine subscription is the perfect gift but you'll need something to show on the big day. View All
Ways to Pay Pocketmags Payment Types
At Pocketmags you get Secure Billing Great Offers HTML Reader Gifting options Loyalty Points