How am I supposed to track to KOSAX on the OLIVI 4W out of EDFM?
The textual description for OLIVI 4W is:

OLIVI FOUR WHISKEY
On track 256° to 6.0 DME MND; RT, on track 333° to KOSAX;
LT, on track 294° to OLIVI.
Climb with 7.9% (480 ft/NM) or more until passing 3000,
then climb with 6.4% (390 ft/NM) or more until passing 6000.


However, the remarks section holds the answer:

1. PDG 7.9% (480 ft/NM) due to obstacles.
   If unable to comply, request alternative instruction by ATC.
2. PDG 6.4% (390 ft/NM) due to airspace structure.
3. After 6.0 DME MND BRNAV equipment necessary.
4. During activity of ED-R 205 (TRA) MAX FL80.



Note "3. After 6.0 DME MND BRNAV equipment necessary."

BRNAV in this case means "Basic RNAV", which is essentially a form of RNAV equipment, but with less stringent certification requirements compared to normal IFR RNAV equipment.