Kids in Scuba
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I'm an SSI Instructor and a Scuba Rangers Instructor. There is an age overlap for a reason. Jr. Open Water is for ages 10 - 15 and Scuba Rangers is for kids ages 8 - 12. The most important thing to consider is the maturity level of the child. Ask yourself this two fold question. "If I were in trouble in the water, could my child 1. Assist in saving my life and 2. If something did happen to me in the water could they at least save theirself?" If the answer to that question is yes, then they are ready for Jr. Open Water. If the answer is no, they belong in Scuba Rangers.
I recently certified two 11 year old girls as Jr. Open Water Divers. When it came to skills, they were more than competent in being able to complete the requirements. They also passed their written tests without a problem. I felt they could competently return themselves to the surface under the guidelines of Jr. Open Water Diving (with an adult, from 60Ft or less.) If I'm being honest, I don't know if they could accomplish this alone and I don't know that they could rescue their adult dive buddy or return themselves to the surface without leadership. Sometimes these are things we don't know until they happen.
I believe Jr. Open Water Certification is an excellent challenge for kids that are mature enough. I have only one additional recommendation. Don't put your child in the position of having to rescue you or themselves. In other words, don't dive one on one with your child. Dive with them in groups with two or more adults to one child, preferably with a group of others being lead by a dive leader. If something happens to you during the dive, there is a greater likelyhood that your child will survive and that you may be rescued.
The most important things to stress with them are a slow ascent rate, completing a safety stop and the two golden rules of scuba... never hold your breath and equalize early and often...
SSI AOWI
Ken Barrick