Some comments from course setter :
The map is based on finnish ”peruskartta” , Finnish Topograhic map at scale 1:50 000 and the countors used are from the same data source. To clarify the view each 20 m contour is bolded, ( index contour) and inbetween the contours are with 5 m interwal. That is the the same way used in the Topograpih maps. Please wist Bulletin 1 and find a link to NLS Citizen MapSite to study the mapping style. Link: NLS Citizen's MapSite
Water in streams is really good in quality and the recommended streams /ponds will be marked on the map. There are many locations to find fresh watrer and the need to carry water will be reduced compared to the most races before. At the moment there is more than 20 points marked on the map indicating fresch water.