The Mini Archipelagos book contains 80 special maps and 20 detailed maps of the Archipelago Sea and the western Gulf of Finland. There are sites in the area where the main depth information on the nautical chart is outside the 10-meter depth curve or is missing altogether. The special maps have been drawn with the help of aerial photographs to provide indicative depth curves. In addition, they contain thousands of rocks.
The Mini Archipelagos book contains 80 special maps and 20 detailed maps of the Archipelago Sea and the western Gulf of Finland. There are sites in the area where the main depth information on the nautical chart is outside the 10-meter depth curve or is missing altogether. The special maps have been drawn with the help of aerial photographs to provide indicative depth curves. In addition, they contain thousands of rocks.