I realize there are already many questions and answers out there related to this issue. However, I continue having a difficult time pinpointing exactly which transformations I should use.
Essentially, I have GPS data that was post processed against the local CORS stations in Pathfinder Office using the reference position from base provider option, which depending on the date and station would be ITRF00 or ITRF08 and exported as NAD83 CORS96 and in later years as NAD83 (2011). Now, I have a Collector app that is using SBAS corrections, so the data is in ITRF 2008 (essentially equal to WGS84 within 10cm/4"), if I'm not mistaken. This means that I have data in 3 different datums or realizations in regards to the NAD83 GPS points.
