I have an iPad Mini at the helm mounted to a rail.
Here was my order:
RAM TAB-TITETM Universal Clamping Cradle for the iPad mini WITH CASE, SKIN OR SLEEVE
RAM Mounts RAM-B-238 RAM 2.43" x 1.31" Diamond Base with 1" Ball
RAM Mount Zinc Coated U-Bolt Base w/1" Ball
RAM 5.25 inch Long Double Socket Arm for 1 inch Ball Bases