csv compatability ? (Rand McNally, Garmin, etc.)

 

I have been working on POI items for the Rand McNally and wondered what the differance's are between the other csv files. How compatable are they during conversion?
Should I be programming for the Garmin CSV to send corrections and new poi's and then change for the Rand.
Changing to the Rand seems to be fairly easy with the use of Extra-Poi Editor and saving as Mio.csv and adding a leading comma in column D.
What's you opinion?

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Gerry J