This is a world-wide hunt for the coordinates of a geocache located in Waterloo, Iowa, but NOT at the posted coordinates. If you use dial-up Internet you may not want to try this one because some of the webpages you will arrive at may be a little slow loading. Either way, broad-band or dial-up, this may be something that you will want to work on a little at a time. You can manually keep track of where you have already looked by printing off this grid.
To determine the missing numbers in this coordinate, 42 _ _. _ _ _, -92 _ _. _ _ _, you will need to find the latitude and longitude (both rounded to the nearest degree) of a yellow placemark tack shown in a fairly close-up Google Earth photo. That image shows a peculiar feature in a desert. The feature looks like a giant's footprint. The tack is in the heel area. I myself find the correct place, click on the thumbtack symbol, move in close and make adjustments as necessary. The value of the coord is shown in a pop-up box that appears when you first click on the placemark icon. Once you determine the degree values, insert them into the following equations.
The degrees of latitude of the tack (rounded to the nearest whole degree) x 1.0776 = the minutes.decimal minutes of the latitude of the cache.
The degrees of longitude of the tack (rounded to the nearest whole degree) x 1.91615 = the minutes.decimal minutes of the longitude of the cache. (After you do this calculation, round to the nearest thousandths place.)
So, where is the desert foot picture? It will come up when you click on one of the boxes in the grid below. There are two other images that show the location of the tack, but from a wider perspective. It would be best to locate the tack image before trying to use the other two “good” images to broaden your perspective. I will confess that I included three distracter images in there as well. They will not be much help and may in fact lead to some frustration; hence the rating of this cache.
The boxes that don’t contain GE images will either lead you to websites that you might find fun or to photos that I have taken. Many of the pictures are stereo pairs. If you want to learn how to see them in spectacular 3D, read about how at my 3D cache.
Why the name, Find Your Blind Spot? To find a picture that will save you a lot of time, place your left eye very close to 10 inches away from the screen. Close your right eye. Stare intently at the eye in the “game board” but pay close attention to the cursor. Move the cursor around on the board until you notice that it virtually vanishes! - EVERYBODY HAS A BLIND SPOT. If you don't find it and would like to, draw a 1/8 inch dot on a blank piece of paper. Look 3 inches to the right of the dot then move you left eye toward and away from the paper. - At the time it disappears it'll be in your peripheral vision. Near that point start clicking and you should find the time saving instructions. Note! If you accomplish finding your blind spot let us know. W/o specific instructions you may miss it. But if I told you exactly where to look then it wouldn't be a challenge, or at least not as much of one. 
Good luck!
-it
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