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.

• open the function in Menu > More > Map Tools, a dialogue appears
• tap Take to take a photo with you phone camera - the more quality camera, the better
• or copy the image from your PC/scanner/internet or a DSLR camera to your Dropbox or the phone photo folder (DCIM) and tap Select to select it

• tap Add and choose a distinct point (a hill summit, crossroads etc.) on your picture
• tap ……… in Map coordinates menu and choose the same point on your background map
• repeat this procedure 4 times - try to select points making a square. You can edit their positions by tapping …… or remove them.

• when you are ready with your four points the status line turns green and the Compute button activates
• calibration points overview appears - indicates their deviation. When it is not large you can name the new map and proceed to its generation

Your calibrated map appears now as an overlay and can be (de)selected in Data manager > Items