You could expect an error about 4 minutes for your latitude and more for your longitude. If the steps in your table are bigger itīs about half the step (17 minutes in the example of the post) if you donīt interpolate. Because the rate of growth for the shadow is zero at noon your error in getting the shortest length will be minor but youīll have a hard time to get the time.<br>So for the original example (stranding somewhere or making a forced landing) it may be of some help. For a hiker itīs of limited use. Provided the hiker keeps track of his movement, he will know his position at least as accurately. So Iīm not too surprised that some people would rather practice firemaking than this navigation method.
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If it isnīt broken, it doesnīt have enough features yet.