Oceanic ProPlus-4 PDC

[Ross19966]

I also have a wife that pretty much only dives on southern vacations. I could do the same and give her the PP4. If I did the Perdix AI on my left wrist and a compass on my right, I can lose the console and it's hose. One less dangly thing to deal with.

Perdix AI must be new to the market. Not all online suppliers even show it on their websites. Perdix AI is not on the Shearwater website any more. I think the Perdix 2TI may have replaced it.

 

[Boarderguy]

I also have a wife that pretty much only dives on southern vacations. I could do the same and give her the PP4. If I did the Perdix AI on my left wrist and a compass on my right, I can lose the console and it's hose. One less dangly thing to deal with.

Perdix AI must be new to the market. Not all online suppliers even show it on their websites. Perdix AI is not on the Shearwater website any more. I think the Perdix 2TI may have replaced it.

The perdix AI has been around since 2016 I believe. The perdix 2 was released summer 22. You can find the perdix AI for sale here aod the $650 - 700. The peridix has a built in compass if you want to ditch your wrist mount.

 

[Ross19966]

So I gave my Sherwood Oasis 1st, 2nd, octo and PP4 to my wife and picked myself up an Aqualung Legend Elite 1st (DIN), 2nd, octo and Perdix 2 ti. Perdix AI's are getting hard to find. They appear on the classified here but they seem to sell real fast. Shearwater stuff seems to have really good resale value. LDS made me a better deal on the Perdix 2/transmitter than I could find anywhere online so I pulled the trigger.

 

[Belzelbub]

If it locks into surface mode for 24 hours after a dive, how can you make another dive the same day. I can see that if I did a dive or multiple dive to limits, but lets say I do a 80ft dive on Nitrox and upon surfacing I am no where near limits. If the unit lock itself in surface mode for 24 hours, I'm sort of screwed for any more dives that day. The manual is really vague on this.

This used to be common on older computers, but it seems that newer ones are doing things a little differently. I've never dove with a PP4, so I'm not sure if this is the issue, but it sounds like it is. In the older computers that I've seen this in, there was a solution, but it starts on dive 1.

The issue seems to be that if you do dive 1 as an Air Dive, you can't then do dive 2 as en EAN dive. Older computers would only track N2 exposure in Air mode, so they don't have any O2 information, that's why they lock you out of EAN for the 24 hours. Air would still work. The workaround was to never use Air mode. Instead, use EAN and set the mix to 21%.

 

[marcus213]

How do you switch the Proplus4 to Nitrox. Manual says you can not do it in surface mode. Do you do it once in the water? I don't see the reasoning for not allowing the switch on the surface. Can someone explain? Other than that, it's not to hard to figure out. I hope I don't have constant issues with it. I'm not real patient when it comes to things like that.

TXT me 336-596-5311 to set up a phone call and i will talk to you and give you a very simple class over the phone and i'll get you squared away with this issue. Very Easy Fix. I'm very good w/ the PP-4 and set up. I wrote a post to you the other night, and after 20 minutes of type it out how to do this SB page was down!! Bummer, just wasted my time. Marcus

 

[MudBug]

I purchased a PP-4 as I wanted an air integrated console DC with LARGE digits. I'm 66 and use magnifiers with my i200C wrist DC.
When I did my first dive with the PP-4 I also kept my i200C on my wrist as back up. It soon became apparent that the PP-4 was giving me way less NDL time. I did some research and found the two DC use different table and the PP-4 could be set to use the same tables as the i200C. (Both DCs are made by Pelagic)

On my next set of dives the PP-4 still showed much less bottom time available and the difference between the two grew greater with subsequent dives done on the same day. It soon got to where my PP-4 was showing 50% NDL time than the i200C. I was diving with my son who also uses the i200C and our i200Cs pretty much agreed with each other on all readouts.

This time I was prepared for this issue and removed the PP-4 from my first stage and put my old SPG/Depth gauge back into service for the rest of my dives.

I guess I am going to have to visit with Huish about this.
Anyone have any suggestions?

 

[Belzelbub]

I purchased a PP-4 as I wanted an air integrated console DC with LARGE digits. I'm 66 and use magnifiers with my i200C wrist DC.
When I did my first dive with the PP-4 I also kept my i200C on my wrist as back up. It soon became apparent that the PP-4 was giving me way less NDL time. I did some research and found the two DC use different table and the PP-4 could be set to use the same tables as the i200C. (Both DCs are made by Pelagic)

This sounds odd. The i200c uses PZ+, the PP4 can either use DSAT or PZ+. I would expect in DSAT that the NDL will be longer as DSAT is generally more liberal than PZ+. I believe DSAT is default on the Oceanics. At least it was on my other DA Oceanics.

Is there a conservatism setting on the PP4? Perhaps this is turned on.

On my next set of dives the PP-4 still showed much less bottom time available and the difference between the two grew greater with subsequent dives done on the same day. It soon got to where my PP-4 was showing 50% NDL time than the i200C. I was diving with my son who also uses the i200C and our i200Cs pretty much agreed with each other on all readouts.

Did you download the dive profiles from both? Depths and times matched? If so, then it doesn't seem like a hardware issue. Sounds like a conservatism setting, which would affect the first dive, and it would make sense that it would have a greater effect on subsequent dives as the starting NDL would be less to begin with.

 

[scrane]

I've had two Oceanic computers fail in that they apply an incorrect altitude adjustment offset. You can compare the dive planning screens on the computer with the printed data in the back of the manual to check.

 

[MudBug]

This sounds odd. The i200c uses PZ+, the PP4 can either use DSAT or PZ+. I would expect in DSAT that the NDL will be longer as DSAT is generally more liberal than PZ+. I believe DSAT is default on the Oceanics. At least it was on my other DA Oceanics.

Is there a conservatism setting on the PP4? Perhaps this is turned on.

Did you download the dive profiles from both? Depths and times matched? If so, then it doesn't seem like a hardware issue. Sounds like a conservatism setting, which would affect the first dive, and it would make sense that it would have a greater effect on subsequent dives as the starting NDL would be less to begin with.

Yes, the i200c uses only the Z+, the PP-4 by default uses DSAT but can be changed to Z+, which I have done.
There is a switch for conservatism but it is off by default and I have left it off. According to the manual if switched on it adds 3K feet to the altitude.

Thank you,
MudBug

 

[MudBug]

I've had two Oceanic computers fail in that they apply an incorrect altitude adjustment offset. You can compare the dive planning screens on the computer with the printed data in the back of the manual to check.

I will explore this.