To move the bookmark, tap the bookmark icon and hold for a second, then drag the bookmark to where you want and drop it. (since v3.1.1).
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You can search a location by its coordinates in the following format: two numerical values represent latitude and longitude separated by a comma (e.g. "48.198634, 16.371648" for Vienna).
Galileo Offline Maps
All the ideas and discussions
Make the pin locations editable so I can place them at an exact lat long. Very disappointed that I can't do that in a paid feature.