Do you do your dive plan?

Or do you leave your dive plan up to the dive master or instructor? Once upon a time you may have hear something like plan your dive and dive your plan, but with computers today most divers most divers basic dive plan is whatever the dive master says in their briefing and then what their computer tells them during the dive. That is if they have a computer at all.

Let’s review three easy ways to do a dive plan.  We will assume that it is our first dive of the day and we are diving on a nice little reef area that is a maximum of 74 feet and we are going to follow the reef along slowly exploring as we work our way to the top of the reef at 40 feet.  Being the first dive of the day the dive master calls for a dive plan of no more than 40 minutes.

Looking at the Dive Table it shows us that a dive to 70 feet allows for 40 minutes of bottom time. But since this dive is actually deeper than 70 feet we look at the time limit for 80 feet and see that we only have 30 minutes. Bummer looks like our dive will be shorter that the others or we adjust our dive plan to a max depth of say 65 feet allowing us the full 40 minutes

dive plan

Or, we get our our handy eRDPml and finding the dive plan mode and following the prompts for multi-level and first dive of the day we see we get 35 minutes for 74 feet. And since we are doing our dive plan, we will plan that depth for say 20 minutes as we will take that long to explore the side and bottom of the reef as we work our way to the top at 40 feet. Again following the prompts on the dive plan tool we see that at 40 feet we now have up to 83 more minutes of bottom time. WOW

dive plan

But, I will dive plan with my computer. My Computer tells me just what the table does, but since it will take a reading every 20 seconds as I dive my time limit is ever growing as I work my way to the top of the reef my computer tells me that I have 87 minutes of bottom time left after 22 minutes.

dive plan

 

See you on the dive boat

 

How many dives can you do in a day?

At some point during open water class a student will ask how many dives they can do in a day. The answer to that is a big “that depends”. I know that is so vague that it begs to be answered, but first let us define a dive as using a tank of air.

Digital Camera
So, just how many dives can you do in a day? Well, are they fun dives or training dives; that is taken in conjunction with a class? PADI standards say that we can do no more than 3 training dives in a day, so that answer is very clear. So how can you do your Open Water and Advanced Open Water in a long weekend or your Advanced Open Water and Rescue in a long weekend? The key word is long as in 3 day weekend. If PADI standards say we can do 3 dives in one day and we need to make 4 dives for open water and 5 for advanced open water it will take 3 days. Dive planning will be a huge part of your weekend and that is a great thing.

Can you combine training dives and fun dives in one day? Of course you can. If you finish your open water training dives in the morning and want to go out on the boat that afternoon and do a 3 tank trip, you can do that. Plan your dives accordingly with your instructor and dive buddy.  How deep are your dives going to be and how long?

So just how many dives can you do in one day? Again, that depends on you and your buddy and how you plan your day and what gas is in your tank. On the liveaboards, we generally do 4 to 5 a day. The dives are generally about 80 feet and for close to an hour with at least 90 minutes or so between dives and yes we are diving computers and nitrox. But, if we are going to explore a shallow reef at so 40 feet on regular air with 90 minute surface time we can probably make 5 or 6. Change air to nitrox and you can cut your surface time to 60 minutes and easily make 6 maybe 7.

So how many dives can you do in one day? That depends on you and your dive planning skills.

dives