Thank you! I don't know why this file is twice smaller than the cyrillic version, but all seems to be working fine in BaseCamp so far. Could you tell me what I was missing in doing the conversion myself.

Used latest free cgpsmapper and what seems to be the latest GMapTool.
Loaded the gmapsupp.img file in the program switched to Split, chose the output directory for the files that will install in basecamp, chose compile preview map, set mapset FID to 1204 and PID to 1 ( I saw it in details for the img file, don't know exact meaning ), typed mapset name and pressed split all/selected. All seemed to execute fine, only problem was in BaseCamp I could not activate the 3D view, although I had altitute data, verified by viewing the vertical profile of a sample route.