Shearwater Pursuit Planning

trimix · 16th February 2008, 18:05

I've just made my first couple of dives with the Shearwater Pursuit (oooooo I love that Auto Backlight!!) and although we're still getting to know each other, I wonder how I can plan a dive profile with the unit...or do I?

I have traditionally been using V-Planner, so i'm intimately familiar with the VPM-B model. Until now I have also been using an HS Explorer (works fine, by the way) which uses a RGBM Model in CF2 setting that I usually use.

Now the S/W uses a GF Model. Hmph.
I've read all that I can about Gradient Factors, and I get it...but how do I plan a dive?
How do I decide, without painful trial-and-error, what setting works for me? Can I compare a particular setting to something I can relate to, such as a particular level of conservatism from V-Planner? I guess I'm looking for some kind of simiulator. Does anyone know of one? In the meantime, I have my chamber-visit kit packed up, ready to go.

Stephane · 16th February 2008, 18:21

Hi,

Doesn't the HS Explorer simulator include a Bühlman algorithm ? (but does it include GF? Don't know).
Or you can use MV-Plan (MV-Plan the Java Dive Planner).

cameron · 16th February 2008, 18:24

Get GAP, you can compare RGBM and gradient factors side by side.

Cam

trimix · 16th February 2008, 18:30

Quote: (Originally Posted by Stephane)

Hi,

Doesn't the HS Explorer simulator include a Bühlman algorithm ?

It does, but my understanding (which could be flawed, o yeah) is that by using these settings (CF 3-9) I'd be riding the 100% M-Curve for deco. Am I wrong? In any rate, these settings are progressively more conservative than the CF2 I use now, and not sure I want to spend that much time in water. I would like to be at a lower GF Hi percentile - but what??? Again, I need a comparison to fully understand how the new GF's will relate to what I do now.
Brain hurts.

Stephane · 16th February 2008, 18:35

Maybe this paper will help you: ftp://decompression.org/pub/Baker/Deep%20Stops.pdf

Ben Field · 17th February 2008, 15:22

Try DDPlan- DDPLAN [FrontPage]

Simple, easy and "lite" software, also includes the legendary mix-a-matic.

kiwi_diver · 17th February 2008, 21:31

I'm in the middle of the same process, trying to find a dive planner that will match the deco profile built by the Pursuit.

I've only done a couple of pot dives with mine so far and have found that FreePlanner predicts the Pursuit's profile pretty well.

http://www.freeplanner.org

It uses Buhlman 16 and GF. Just check that the default GF matches that set on your Pursuit and adjust FreePlanner if needed.

**wedivebc** · 17th February 2008, 21:54

Quote: (Originally Posted by trimix)

I've just made my first couple of dives with the Shearwater Pursuit (oooooo I love that Auto Backlight!!) and although we're still getting to know each other, I wonder how I can plan a dive profile with the unit...or do I?

I have traditionally been using V-Planner, so i'm intimately familiar with the VPM-B model. Until now I have also been using an HS Explorer (works fine, by the way) which uses a RGBM Model in CF2 setting that I usually use.

Now the S/W uses a GF Model. Hmph.
I've read all that I can about Gradient Factors, and I get it...but how do I plan a dive?
How do I decide, without painful trial-and-error, what setting works for me? Can I compare a particular setting to something I can relate to, such as a particular level of conservatism from V-Planner? I guess I'm looking for some kind of simiulator. Does anyone know of one? In the meantime, I have my chamber-visit kit packed up, ready to go.

Download the old version of GAP GAP-Software and try the differnet GF settings and you will see how to make it change for various dives. You can compare the profiles generated with v-planner for instance and see how they relate. Be aware that a GF setting for one depth will not relate to VMP for another depth so don't make any assumptions.
For old GAP pay close attention to install instructions or it won't work right. (but its free)

16th February 2008, 18:05	#1 (permalink)
trimix New Member Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Dec 2005 Location: Abbotsford, BC, Canada Posts: 48	Shearwater Pursuit Planning I've just made my first couple of dives with the Shearwater Pursuit (oooooo I love that Auto Backlight!!) and although we're still getting to know each other, I wonder how I can plan a dive profile with the unit...or do I? I have traditionally been using V-Planner, so i'm intimately familiar with the VPM-B model. Until now I have also been using an HS Explorer (works fine, by the way) which uses a RGBM Model in CF2 setting that I usually use. Now the S/W uses a GF Model. Hmph. I've read all that I can about Gradient Factors, and I get it...but how do I plan a dive? How do I decide, without painful trial-and-error, what setting works for me? Can I compare a particular setting to something I can relate to, such as a particular level of conservatism from V-Planner? I guess I'm looking for some kind of simiulator. Does anyone know of one? In the meantime, I have my chamber-visit kit packed up, ready to go. __________________ *BOOM!* Last edited by trimix : 16th February 2008 at 18:09.
(Online)

16th February 2008, 18:21	#2 (permalink)
Stephane Stéphane Acounis Current Rebreather/s: rEvo Other Rebreather/s: rEvo Join Date: Nov 2005 Location: Nantes - France Posts: 773	Re: Shearwater Pursuit Planning Hi, Doesn't the HS Explorer simulator include a Bühlman algorithm ? (but does it include GF? Don't know). Or you can use MV-Plan (MV-Plan the Java Dive Planner). __________________ Stéphane
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16th February 2008, 18:24	#3 (permalink)
cameron Classic Kiss 124 Current Rebreather/s: Classic Kiss Other Rebreather/s: Join Date: Apr 2005 Location: Toronto, Ontario, Canada Posts: 252	Re: Shearwater Pursuit Planning Get GAP, you can compare RGBM and gradient factors side by side. Cam __________________ Reclaim at work and CCR at home, life is good
(Online)

16th February 2008, 18:30	#4 (permalink)
trimix New Member Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Dec 2005 Location: Abbotsford, BC, Canada Posts: 48	Re: Shearwater Pursuit Planning Quote: (Originally Posted by Stephane) Hi, Doesn't the HS Explorer simulator include a Bühlman algorithm ? It does, but my understanding (which could be flawed, o yeah) is that by using these settings (CF 3-9) I'd be riding the 100% M-Curve for deco. Am I wrong? In any rate, these settings are progressively more conservative than the CF2 I use now, and not sure I want to spend that much time in water. I would like to be at a lower GF Hi percentile - but what??? Again, I need a comparison to fully understand how the new GF's will relate to what I do now. Brain hurts. __________________ *BOOM!*
(Online)

16th February 2008, 18:35	#5 (permalink)
Stephane Stéphane Acounis Current Rebreather/s: rEvo Other Rebreather/s: rEvo Join Date: Nov 2005 Location: Nantes - France Posts: 773	Re: Shearwater Pursuit Planning Maybe this paper will help you: ftp://decompression.org/pub/Baker/Deep%20Stops.pdf __________________ Stéphane
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17th February 2008, 15:22	#6 (permalink)
Ben Field CK+Shearwater Current Rebreather/s: Classic Kiss Other Rebreather/s: Sport Kiss Join Date: Aug 2005 Location: London, England Posts: 1,634	Re: Shearwater Pursuit Planning Try DDPlan- DDPLAN [FrontPage] Simple, easy and "lite" software, also includes the legendary mix-a-matic. __________________ Know your PPO2, Pre-breath, Use checklists, Validate cells at 6mtrs, Use pure O2 at or near surface, Use a BOV, Don't dive Solo, Change Slime and Cells as recommended by Manufacturer and RTFM! Beware Fridge Suck! www.hugsac.org.uk Last edited by Ben Field : 18th February 2008 at 08:19.
(Online)

17th February 2008, 21:31	#7 (permalink)
kiwi_diver Alias - Ray Mansell Current Rebreather/s: Other SCR Other Rebreather/s: Other SCR Join Date: Aug 2007 Location: Auckland, New Zealand Posts: 157	Re: Shearwater Pursuit Planning I'm in the middle of the same process, trying to find a dive planner that will match the deco profile built by the Pursuit. I've only done a couple of pot dives with mine so far and have found that FreePlanner predicts the Pursuit's profile pretty well. http://www.freeplanner.org It uses Buhlman 16 and GF. Just check that the default GF matches that set on your Pursuit and adjust FreePlanner if needed. __________________ Ray. == Latitude 36 South, where the deeper you dive, the warmer it gets! ==
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17th February 2008, 21:54	#8 (permalink)
wedivebc Dave Tomblin Current Rebreather/s: Megalodon Other CCR Other Rebreather/s: Not Bought Yet Inspiration Classic Sport Kiss Other CCR Join Date: Feb 2005 Location: Vancouver Island BC Canada Posts: 1,447	Re: Shearwater Pursuit Planning Quote: (Originally Posted by trimix) I've just made my first couple of dives with the Shearwater Pursuit (oooooo I love that Auto Backlight!!) and although we're still getting to know each other, I wonder how I can plan a dive profile with the unit...or do I? I have traditionally been using V-Planner, so i'm intimately familiar with the VPM-B model. Until now I have also been using an HS Explorer (works fine, by the way) which uses a RGBM Model in CF2 setting that I usually use. Now the S/W uses a GF Model. Hmph. I've read all that I can about Gradient Factors, and I get it...but how do I plan a dive? How do I decide, without painful trial-and-error, what setting works for me? Can I compare a particular setting to something I can relate to, such as a particular level of conservatism from V-Planner? I guess I'm looking for some kind of simiulator. Does anyone know of one? In the meantime, I have my chamber-visit kit packed up, ready to go. Download the old version of GAP GAP-Software and try the differnet GF settings and you will see how to make it change for various dives. You can compare the profiles generated with v-planner for instance and see how they relate. Be aware that a GF setting for one depth will not relate to VMP for another depth so don't make any assumptions. For old GAP pay close attention to install instructions or it won't work right. (but its free) __________________ Cheers, Dave.... Man is the only animal burdened with the knowledge he will eventually die
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