Recommendations regarding how to create trigger-zones

When creating city tours, it is important to draw and position an object’s trigger-zone correctly. Each trigger-zone belongs to a particular object on the tour and is responsible for activating the audio story about this object. The audio story will automatically start playing once the tourist crosses the boundary of a trigger zone.


Determining the position of tourists (and hence their entry into a trigger-zone) is achieved using their smartphone. When creating trigger-zones, therefore, it is important to consider several issues regarding how they work.
Below are a number of simple recommendations regarding how to create trigger-zones.

Recommendation 1.

When creating a trigger-zone, take into account the margin of error when determining a tourist’s position using a smartphone.To compensate for this error, widen the trigger-zone boundaries relative to the calculated values – allow for a certain ‘extra’ area.

In heavily built-up areas (where there are skyscrapers or narrow streets in city centers), the potential accuracy of determining a tourist’’s position drops. The trigger-zone boundaries therefore need to be increased by 15-20 meters in each direction.


Important: When drawing trigger-zones, take care not to make them too large. In this case, the tourists might hear a story too early, before they have reached the object, or even while on a nearby street. The optimum trigger-zone size is the distance that can be covered in 1-1.5 minutes (65-100m on foot, 200-300m by bike).

Recommendation 2.

Avoid complex shapes:


Recommendation 3.

Having drawn the trigger-zone, check the results: