This isn’t quite my area, but I read a fascinating review of an app and method to put construction plans on your mobile device.  The app has an easy zoom feature, so the small screen of an iPad relative to the large nature of jobsite plans is not an issue.  One can also add photos to the plans as the jobsite continues.  A very robust app.

Again, this is not my area but the review was fascinating – here is a link to the original article:

http://conappguru.wordpress.com/2014/01/25/top-5-apps-review-3-plan-viewers-plangrid/