Depth contours

The dataset contains certain depth contours of the Baltic Sea basin. The dataset contains certain depth contours of the Baltic Sea basin. The chosen depths are 10, 20, 50, 100, 200, 300, 400 and 500 m (since these are close to the contours shown on Finnish paper charts). These contours are derived from a relatively coarse and averaged grid of depths and so are not to be used in any large scale applications or in navigation.