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This feature enables calibrating of an image of map and placing it over a background 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 and use it for your further navigation. This option is available only to Locus Map Pro users.
We recommend to copy the image from your PC/scanner/internet or a DSLR camera to your Dropbox or the phone memory before selecting it to get better results
If you have chosen a big image it is highly recommended to check Optimize map to divide the map image into many small maps (tiles) bundled into one file.
If you have more map images of the same size and scale to calibrate you can use one configuration for calibrating them all: