Observationsort Haparanda Hernosand Fal un Upsala Stockholm Karlstad Göteborg Visby Karlshamn Vardö Bodö Kristiansund Skudesnäs Oxö ( Krisand Köpenhamn Fanö ( Danm Borkum Hamburg .™ Swinemiinde Neufkhrw asser KrefeldLeipzig