Recently a sailor asked why he didn’t see any people anchored off the beautiful beach at Treasure Cay — the chart showed good water. We just responded go to Google Earth and see what the sand bores (not bars, here) look like. Just a few weeks later Google introduced Google Earth Engine. It’s a 1984 – 2012 time-lapse of planetary changes captured by Landsat.
To see what we mean, go to the link above and type “Green Turtle Cay” in the search box. Look in the regions we have highlighted with arrows, and you will see why charts are guidance, not flattened reality. Just go to full magnification, shift the image up and to the left and watch the sand off Treasure Cay writhe (yellow arrow area) and Green Turtle Cay grow to the SE (red arrow area). We would have provided a direct link to the imagery, but the Google Earth Engine doesn’t support that.