Karttakeskus is the publisher of aeronautical chart (ANC) materials, but the producer of the charts, Finavia, still provides the aviation elements to the charts. There is a chart sheet grid and legend on the reverse of the chart. The charts are delivered as straight sheets. The size of the Vaasa chart is 82,1 x 73,3 cm.
Any changes to the charts after their publishing must be checked on the aeronautical information service page, under 'AIS Products and Services' > 'Corrections to ANC charts'. You can find there also legend in A4 size.