Garmin Vista Hcx, track follow with OSM-map

I might want to buy a Garmin Vista second hand, I have a possibility to do so.
My question is whether OSM maps work in the Vista and use it to follow tracks.
In a wikidoc. http://wiki.openstreetmap.org/wiki/Garmin/eTrex_Vista_HCx, here I read something that I interprete as: not possible. Is that indeed the case?
Thanks for any answer.