From LimeSurvey Manual
Use mapping service (location_mapservice)
If this option is activated, then the free text question type will display a map and not a text box to the respondents (they cannot be used both together concurrently).
- Off (default)
- OpenStreetMap via MapQuest
- Google Maps
Google Map API Key!
If the Google Maps option is selected and the question is set to mandatory, the respondent must move the red point or enter the geographical data in the latitude/longitude textbox. The user cannot rely on the default values and hit the "Next" button. It is highly recommended to advise the users about this beforehand in the question text.