UPDATE: Geotagged my Nicaragua synth, but it didn't appear on Map Explore. I read that synth must be at least 18 images, and over 25% synthy. Mine have enuf images, but is only 18% synthy:( If u read the description for my synth u will understand why. Oh, well.
BTW, a search for "Nicaragua" returns two pages of synths; just not geotagged.