GPS
This is very nice. Very clear, and the 3D interactives are excellent at guiding the explanation.<p>One thing that I thought was a little confusing was right at the beginning, when we were estimating the position of the figurine and there was an area of uncertainty shown by the yellow circle.<p>It isn't clear <i>how</i> you're estimating position, and why we have an area of uncertainty. At first I figured it was going to explain it using triangulation (measurement of angles) but there's no reason triangulation wouldn't be exactly as accurate as the tape measure method on a 2D surface, so wouldn't explain the area of uncertainty.<p>The description merely says:<p>> Just by using these three reference points we can relate the figurine’s position in the environment to an approximate placement on the map as show with the yellow shape on the right.<p>I worry that having this ambiguity so early on might put some people off from reading the rest, because they figure they don't understand that and so won't understand the rest of it.