Just downloaded my first OSM map onto my Garmin etrex 30x from http://garmin.openstreetmap.nl/. I always liked the extremly fine level of detail of OSM, as compared to other maps I know it contains really about every dirt path there is.
The map I just downloaded is working fine, however there are a few details I'd like to change.
There are way to many points of interest (grocery shops, gas stations, hairdressers etc.) marked on the map and I almost can't read anything. I'd like to delete these points category-wise (say, remove hairdressers but keep gas stations) to only keep what's relevant to me.
I'd like to change colors and line types of streets (say, make all trails a fine black dotted line and all highways thick and purple).
I'd like to adjust which elements show at which zoom level (say, only show trails when the area shown on screen is smaller than 20x20 meter).
Is there any software (preferably free) I can use to make these changes? Is there any website where I can customize these things before downloading? Or is there any other source of finely detailed maps I can use (relevant region is Central Europe)?