New Mac OS X Dive App
- Thread starter t0w
- Start date
Please register or login
Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.
Benefits of registering include
- Ability to post and comment on topics and discussions.
- A Free photo gallery to share your dive photos with the world.
- You can make this box go away
Overall a great app. Just one point though. I was doing some work in MacDive, manually adding dives and content for about an hour. I had made a lot of modifications. Then unexpectedly the app crashed. When I restarted it all of my changes were gone! :shocked2:
Does the program only save on exit? If so is there any way it can be modified to periodically save itself to prevent this happening? I lost a lot of work.
Cheers. AA
Does the program only save on exit? If so is there any way it can be modified to periodically save itself to prevent this happening? I lost a lot of work.
Cheers. AA
Hmm, that's not good. In the future (for anyone), if it crashes, send me the crash report! AA, send me an email, and we'll see if we can get some info on what happened. I know that doesn't help you get your work back, but at least we can try and prevent it from happening again.
It only automatically saves on exit, yes, but you can File -> Save whenever you like. But I can look at adding an autosave feature that triggers a save more regularly.
Kaliber35
Contributor
Im having an issue with the app. Maybe I can get some help!
I am wanting to manually enter my SAC rate. As soon as I enter anything other than 00.00 I can no longer click on anything else. The value I input is not saved. When I put it back to 00.00 I can once again navigate the program.
I am wanting to manually enter my SAC rate. As soon as I enter anything other than 00.00 I can no longer click on anything else. The value I input is not saved. When I put it back to 00.00 I can once again navigate the program.
Did you email me about this ? Someone else did!
The SAC rate is dynamically calculated based on the air/tank. You shouldn't be able to manually enter it (well, not directly - you need to enter the actual values it uses to compute). I'll fix this before I release the next version.
DoogaDiver
Contributor
t0w, or any other knowledgeable person...
First, great program! I appreciate your making this available to all of us Mac users.
My question is in regard to using the program to calculate SAC rate. I understand the concept of how to manually calculate SAC. What confuses me is why this program, as well as other computer based dive log software, require the cylinder working pressure in order to calculate SAC. I would think the cylinder size (volume) and pounds consumed would be all that would be needed for these calculations. I want to ensure I am entering the correct data so as to not skew my SAC rate.
Should I simply enter 3000 for an AL-80 and 3500 for a HP steel 100, or is there more to this?
Thank you again. I am fairly new to the world of dive computers and their associated software, so this is a learning experience.
First, great program! I appreciate your making this available to all of us Mac users.
My question is in regard to using the program to calculate SAC rate. I understand the concept of how to manually calculate SAC. What confuses me is why this program, as well as other computer based dive log software, require the cylinder working pressure in order to calculate SAC. I would think the cylinder size (volume) and pounds consumed would be all that would be needed for these calculations. I want to ensure I am entering the correct data so as to not skew my SAC rate.
Should I simply enter 3000 for an AL-80 and 3500 for a HP steel 100, or is there more to this?
Thank you again. I am fairly new to the world of dive computers and their associated software, so this is a learning experience.
As I understand it, there are two different general models for specifying the size of tanks.
The european or metric approach specifies the actual internal volume of the tank, e.g., 12 liters. If you took the valve off, filled it with water, and poured that into a measuring container, that's what you'd measure.
The US or imperial approach specifies the amount of 1 atm air that will be contained in the bottle at the working pressure. You can tell with common sense that an al80 doesn't have an internal volume of 80 cubic feet, so that 80 means something else. What it means, using the nominal numbers we generally use, is that if an al80 is filled to its working pressure of 3000 psi, it will contain the same gas that will occupy 80 cubic feet at 1 atmosphere (about 14.7 psi).
So you need two numbers, the tank cubic feet rating and the working pressure at which that cubic foot rating is made.
Your examples are about right, although if you search around you'll find some tables with more precise values, for example, a standard al80 actually holds something like 77.5 cubic feet of 1-atm gas at 3000 psi.
OK, look here for example:
Scuba Cylinder Specification Chart from Huron Scuba, Ann Arbor Michigan
Similar threads
