UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Notice of Effectiveness
Effectiveness Date:	April 9, 2014 4:00 P.M.

Form:	S-4
CIK: 0000866609 Company Name: ION GEOPHYSICAL CORP File Number: 333-194110
CIK: 0001600867 Company Name: GX Technology Corp File Number: 333-194110-03
CIK: 0001600906 Company Name: ION EXPLORATION PRODUCTS (U.S.A.), INC. File Number: 333-194110-02
CIK: 0001600904 Company Name: I/O MARINE SYSTEMS, INC. File Number: 333-194110-01