Guys: I have 2 12" Live units along with structure scan, point one. If I want to update the Lives I know via wifi I know I need a micro card for the unit. My question is would that card be able to update the 2nd unit jus by placing in thd unit and turning on or do I have to connect to the wifi again and re-download. Also any idea where to find the 18.3 update for the structure scan? Don't want to go to the 19.1. Thank you.