Why do you need dead/ded reckoning when you can see the ground?

Well, it depends how much of the ground you can see (i.e. altitude,
haze) and how much of the ground your chart portrays. Depending on
where you are, there may be a stretch where you can't really see
anything identifiable, and then in eight minutes you expect to see a
lake with a curve in it and a dam.

Well, you do but it's off to the left. No, that's not the right one -
that must be one that's not charted, because it's only been four minutes.

Jose
--
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