In an attempt to get things back on track here, I will make one firsthand observation about constructing signals or markers or monuments, in 100 degree-plus heat, with little or no water or food, over the course of several days (let's toss in little or no sleep as well): It can be extremely difficult to mentally whip yourself into venturing out onto that glaring white hot hell known as the beach - where your signals will have to be made to have any hope of being seen - hour after hour and day after day, even if you know your life depends on it. Survivor apathy can be quite debilitating when coupled with extreme physical deprivation. If you haven't experienced it, don't discount it lightly.
And that's all I've got to say about that.
LTM, who prefers umbrella drinks,
Monty Fowler, TIGHAR No. 2189 CER