Open Street Map is an open source map of the world, created and amended by people all over the planet. It emphasizes local knowledge, so if you're in a city and know of a new route or location, you can feel free to add it. There are many types of contributors, from mapping enthusiasts, to professionals, to humanitarians that help add things during disasters. The map shown here was listed as a great example of a community-made map of Pompeii, Italy.
Citymaps is a global social mapping tool, made to integrate with social media and your personal preferences. You can create your own maps on the go, explore your friends maps, and share yours with others. Each store or restaurant location is represented by its logo, making them easy to find, and the app offers turn-by-turn directions as well.
NASA Earth Now
This app visualizes global climate data from satellites so you can view carbon monoxide, carbon dioxide, air temperatures, and water vapor levels. At the bottom are color-coded legends to show you how they vary around the world. The Earth can rotate 360 degrees, and you can zoom in and out with the swipe of a finger.
Star Walk
This stargazing app allows you to map the constellations, no matter where you are. There are over 200,000 celestial bodies to view on the app, which gives you information, extra views, and stories about them. Just point your phone to the night sky.
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