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The Poseidon weDive App Makes Dive Planning Easy

Steve Newman from SSI Reviews The Poseidon weDive App and Provides Step By Step Instructions for Planning Your Dive!

Have you ever arrived at a new site and wished you had a quick and easy way to forecast the dive duration, oxygen exposure (OTU’s), and gas requirements for the dive? Dive planning is an important part of every underwater adventure, however, it is typically viewed as the least enjoyable component, that is, until the launch of the Poseidon weDive App! If you haven't already downloaded the app, you can find it in the iTunes Store by Clicking Here!

Should dive planning be fun?

Obviously no one told the software designers at Poseidon that dive planning should be a boring experience. Where are the tables and the endless tabbing between data in-put fields? Using weDive resembles a video gaming experience much more than dive planning.

In this blog series, we will take a look at how instructors and divers can integrate this valuable tool into their diving experience. We will examine the basic features, planning tools, advanced features, and tips on using the WeDive App as you conduct CCR training courses.

Can a dive planner be sexy?

IMG_0003If you haven’t already, download the weDive App, grab your iOS device and hold on as we take the basic tour. When the App opens, hold your device in the “portrait” orientation and the “Dive Settings” screen appears. Rotate it to the “landscape” orientation and everything you know about dive planning changes!

Suddenly, dive planning becomes a visual and tactile experience. Divers can immediately grasp the relationship between depth, dive time, gas use and oxygen exposure. And, yes, there’s this intriguing blue button that invites you to “play”. So go ahead, put your finger on it, move it up, down, left, right and watch everything recalculate the second you let go.

Creating your first dive plan

Resist the urge to adjust anything and follow along as we plan your first dive. By now you realize that meters and liters are the default units for the weDive App (yes they can be changed). With your finger on the button, drag it down until the depth is 18 meters (that’s approximately 60 feet for imperialists). Slide the button to the right along the timeline, until the you reach a 1:00 hour runtime, and release.

That’s it, your dive plan is complete!


A look at the top numbers

Starting in the top left corner of the display, let’s take a look at the available information. First you will see Dive Number: 1 (1). This means we are on dive 1 of a (1) dive series. The weDive App is capable of repetitive dive calculations. In a future example we will see this change to 2 of a (2) dive series.

OTU Count: 81 (81) Units. The oxygen exposure for the current dive and total (81) for a series of dives (in this case only one) is displayed here.

Dive Time: 62 min is next. This provides a graphic way to explain to students that descent time is included in the 60 minute bottom time and the ascent, based on 9 meters (30 feet) per minute, will account for the extra two minutes of runtime to surface.

The default O2 consumption rate is 0.8 Liters per minute which is used to calculate the Gas Usage: O2: 50 (50) L . The weDive App calculates the usage by multiplying the consumption rate by the total runtime. In this case, 0.8 x 62 minutes. The (50) value is the total consumption for a series of dives which, in this case, is a single dive.

On the button

Five key pieces of information about the dive are displayed at the button. The dive depth in this example is 18m and just to the right, the dive time is displayed as 01:00 h.

On the next row, (21/0) refers to the gas blend (mix) contained in the diluent cylinder. The 21 refers to the percentage of oxygen and the 0 is the percentage of helium. Trimix planning functions are included!

The next number, 0.59, is the partial pressure of oxygen (ppO2) of the diluent if it were breathed as an open circuit, bailout gas. This is calculated by multiplying the absolute pressure (2.8 ATA) times the fraction of oxygen (0.21).

“0” the most important plan number of all

Just to the right of the ppO2, you will notice 0 L. This value, at first, seems rather meaningless. It will, however, display the bailout gas requirement when the open circuit bailout option is selected. This tool can be used to visually convey an important planning step to new CCR divers. Bailout gas planning procedures (including when off-board gas is required and how much to carry) will be covered in the next blog.

Forecasting vs. Planning

“Plan your dive and dive your plan” was a saying that was surely coined sometime around the time of the first dive that did not end well. An open circuit diver is far more likely to follow the “square profile” described by a set of classic dive tables while the Poseidon MKVI and Poseidon 7 afford dive capabilities well beyond open circuit limitations. At best, the CCR dive plan is a forecast of what the diver may expect and is used to establish key limits that must not be exceeded.

The range and freedom provided by the CCR diving system can easily lead a diver into complacency and the sense that dive planning is not important. Every CCR diver has an obligation to forecast the depth, time, oxygen exposure, scrubber duration, decompression obligation, bailout requirement, and diluent and oxygen gas consumption on every dive. Thanks to weDive, it is no longer a chore.