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On-board calibrator enables calibrating an image and placing it over the map. For example when you go to the ZOO or a park simply take a picture of its detailed plan displayed on a board at the entrance. After that you can calibrate the photo according to your background map a use it for your further navigation.
If you have chosen a huge picture, it is highly recommended to divide the map image into many small maps (tiles) bundled into one file.
Your calibrated map appears now as an overlay and can be (de)selected in Data manager > Items