UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Notice of Effectiveness
Effectiveness Date:	March 10, 2021 4:00 P.M.

Form:	S-4
CIK: 0000866609 Company Name: ION GEOPHYSICAL CORP File Number: 333-252591
CIK: 0001600867 Company Name: GX Technology Corp File Number: 333-252591-04
CIK: 0001600906 Company Name: ION EXPLORATION PRODUCTS (U.S.A.), INC. File Number: 333-252591-03
CIK: 0001600904 Company Name: I/O MARINE SYSTEMS, INC. File Number: 333-252591-02
CIK: 0001841419 Company Name: GX Geoscience Corporation, S. de R.L. de C.V. File Number: 333-252591-01