I've not encountered your particular concern on VOR tracking, but I have noticed that my 196 has some position mapping errors. Most noticeably: heading east off the south coast at about 600ft , with the shoreline definitely at least 100 yds off to my left, the 196 map placed me clearly inland. On that basis I certainly wouldn't rely on the 196 to skim me past controlled airspace! At ground level the error is less, but still noticeable: it shows my take-offs as being to one side of the runway, and thats just not possible .....
Slip