HI JLH9,
I'm not at all sure you are right about most everybody agreeing with my PLB/3 day plan. But I'm glad you do. I have become convinced that my plan is the best for almost anybody in a deep desert survival situation. For most, attempting to walk out is suicide. Is this the most common mistake? Might be. Panic tends to cause mistakes.
After all the discussion about the three day plan and the need to carry sufficient water in a desert situation, I made the statement that I probably would not need to carry any water at all. No one contradicted me. I was surprised. In truth, this statement was based on a fact deeply buried in my memory. It was a fuzzy memory. I was not really sure about it. I decided that such an important topic deserved some research.
I found this information on the internet. As you can see, the no water scenario is realistic for a three day plan even in high desert and high desert temperatures (100 deg F). The ground rules to make it work is to not be active (no walk out!) and stay in the shade. My plan always included shade as part of my survival kit. Take a look.
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As you can see, for temperatures of 100 deg F, 5 days survival is predicted without any water intake. This fits with my three day plan. In the high desert 100 deg F is a realistic high. However, the low deserts commonly reach 110 deg F and only 3 days survival is predicted with no water. This is certainly a case where water would be necessary to assure survival. I have always planned to carry water. The question that was hammered was would the water be available if it stayed with the vehicle; or if I was injured could I reach the water. I'll admit that there are scenarios where vehicle located water may not be available though, I think, very unlikely. And, don't discount a refrigerator full of soft drinks.
I have to assure you that I will not be driving in the deep desert regions in the low desert in summer. Too hot to be worth doing (110 deg F). That's just nuts. But the high deserts are very much a possibility. In fact, I do it every year. Even so, I really try to avoid August, the hottest month. It's just not comfortable. So, it seems that the PLB/3 day plan is realistic even with no water.
Don't misunderstand. I am not suggesting that water is left at home. Not at all. I'm just suggesting that in the worst case that I would subject myself to, having no water for 3 days is a realistic survival strategy.
BTW, New Mexico Search and Rescue has a goal for each rescue. They attempt to rescue within 12 hours after notification. They are also very enthusiastic about PLB's. The chief of the unit felt that my PLB/3 day plan is completely realistic.
Sparky