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There is a steemit worldmap project. People can sign their travel posts on that map. Maybe your project and that steemit worldmap project could be combined. For example: 1 map with 2 layers. People could be filter the layers. So, they could see both layers or one of them. One map is better instead of lots of steemit maps.

Yes i made some research already on current similar projects. I know that one. I like the simple concept, but I do not think is a realistic approach as you expect users to manually insert the data.