The drift figures can't be taken away from you but most examiners will take away the moving map, well zoom out of it anyway making it useless. The track is very useful as you have found out, as is the wind (this can be taken away apparently). To be honest the needles are rather good, although dip is quite large in the DA42 but there is so much information that you will soon get to grips with it. The most important thing with the Garmin and the IR is to ensure that you don't let all the info available break down your scan.
A lot of examiners will give you your GPS etc back once you have completed the first sector and the procedure to return to your next airport for the next procedure.