Sea grid data from Traficom: ENC-tuotejako © Traficom 2019
Data from the National Land Survey of Finland: Map sheet grid and Municipal Division 1:10 000 datasets (11/2017). Licensed by National Land Survey open data CC 4.0 licence: http://www.maanmittauslaitos.fi/en/opendata-licence-cc40
Layer styles in layer_styles.sql licensed by Gispo Ltd. under CC-BY-4.0.