These maps show the distribution of sightings by year. A triangle shows the location of a sighting, where known; where the location is vague (ie, at sea), it is marked by a circle.
1909
1912
1913
The British phantom airship scares, 1909-1913
These maps show the distribution of sightings by year. A triangle shows the location of a sighting, where known; where the location is vague (ie, at sea), it is marked by a circle.
1909
1912
1913