thanks for the replies.
@hanneshh: "searchable" means what philippep means, i want to search tag trails!
@smsm1: Thank you, good idea!
btw, I edited it with Global Mapper and GPSMapEdit
thanks a lot for the comments!
- I have tagged it in JOSM as a trail
- I have editd it, the points are not too close, I think. If dowloaded and converted back to .img or so, it should be a good GPS Receiver map to walk, so it's supposed to be rather dense?