Google Maps saves the most recent 100 locations typed in the search box so you can easily retrieve them. If you want to migrate to a different Google account or you'd like to view the locations in Google Earth, Bing Maps or another mapping service, you can now export the saved locations to a KML file.
In addition to exporting the locations, Google Maps also lets you import a KML file that includes a list of placemarks.
This is just one of the many Google features that prevent data "lock-in". Google has a Data Liberation team "whose singular goal is to make it easier for users to move their data in and out of Google products". It's a great initiative from a company that has always encouraged competition. If Blogger is no longer your platform of choice, you can migrate your data to WordPress or a different service. If Gmail is frequently down, has a poor spam filter or it's no longer your favorite webmail service, you can auto-forward your mail to a different service and fetch the existing messages using POP or IMAP.
"Many web services make it difficult to leave their services - you have to pay them for exporting your data, or jump through all sorts of technical hoops -- for example, exporting your photos one by one, versus all at once. We believe that users - not products - own their data, and should be able to quickly and easily take that data out of any product without a hassle," explains Google's public policy blog.
* Google's public policy blog
* This blog's In/Out label
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