Icons on the map
The small 
/ 
icons on the map indicate XC trails which are combined in “relations” (layer “marked XC Trails”), typically this is done for loops. Click these icons to highlight the entire loop, and get additional information for that loop.
Color coding of icons
For MTB trails, the icon color for the trails indicates the overall trail difficulty (as taken from the mtb:difficulty tag in the OSM database):
Blue: easy
Red: intermediate
Black: advanced
Unkown
Note that this does not correspond to the mtb:scale which might vary significantly along an entire trail.
For cross-country trails, the icon color for the trails indicate the trail status (as edited/updated directly through this site):
Red: Closed-
Green: Open/perfect 
Yellow: Open/fair
White: unkown
MTB trail markup
style = tracktype (for tracks and paths):
- ____ unknown or no track/path
- __ __ grade1
- _ _ _ grade2
- . _ . _ grade3
color = mtb:scale:
- unknown
- blue: scale 0 and scale 1
- red: scale 2
- black: scale 3
Cross country skiing trail markup
style = grooming:
- _ _ _ unknown
- ____ skating
- . _ . _ classic+skating
- __ __ classic
color = difficulty:
- unknown
- easy
- intermediate
- advanced
Altitude profile
Click anywhere on the altitude profile to set a marker on the map which corresponds to the position in the profile. Turn gradients on and off to overlay uphill/downhill gradients on the map, the color code for the gradients is:
- Green: downhill (incline < -2%)
- Blue: flat (incline -2% to 2%)
- Yellow: incline 2% to 8%
- Orange: incline 8% to 20%
- Red: incline > 20%