EXHIBIT 10.36
 SIXTH AMENDMENT AND WAIVER TO
AMENDED AND RESTATED CREDIT AGREEMENT
 Sixth Amendment and Waiver to Amended and Restated Credit Agreement Sixth Amendment this Amendment Sixth Amendment Effective Date Domestic Borrower société à responsabilité limitée Foreign Borrower Borrowers Guarantors New Lender Administrative Agent
 RECITALS
 Existing Lenders Credit Agreement
   Defined Terms




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Amendments to the Credit Agreement
 Section 2.18
 Commitment
Increase Notice provided however Section 2.18
  New Lender Schedule 2.01 Section 1.01




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Section 2.18(c) Section 2.18(d) Re-Allocation Date
 Schedule 2.01
 Waivers of Certain Provisions of Credit Agreement
  BGP




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Increase in Commitments and Borrowing Request; Joinder of New Lender
 Commitment Increase and Notice
 Consent of Administrative Agent
 Joinder of New Lender
 Acknowledgments of Administrative Agent and Existing Lenders Regarding Commitment
Increase, Equity Conversion Rights of New Lender




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ipso facto
 Consent of the Borrowers, Administrative Agent and the Issuing Lenders Regarding
Conversion of Revolving Loan Commitment of the New Lender
 Conditions to Effectiveness
   JV Term Sheet




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Conditions Subsequent
   Representations and Warranties
 Continuing Effect of the Credit Agreement
 Ratification
 Counterparts




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References
 Headings Descriptive
 Governing Law
 Release by Borrowers and Guarantors whether or not caused by the sole or partial
negligence of any indemnified party
 Final Agreement of the Parties




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DOMESTIC BORROWER:
ION GEOPHYSICAL CORPORATION,
a Delaware corporationBy:
    
    /s/ David L. RolandName:
    David L. RolandTitle:
    Senior Vice President, General Counsel and
Corporate SecretaryFOREIGN BORROWER:
ION INTERNATIONAL S.À R.L.,
a Luxembourg private limited liability companyBy:
    
    /s/ David L. RolandName:
    David L. RolandTitle:
    Category A Manager




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GUARANTORS OF DOMESTIC AND FOREIGN LOANS:
GX TECHNOLOGY CORPORATION,
a Texas corporationBy:
    
    /s/ David L. RolandName:
    David L. RolandTitle:
    Vice PresidentION EXPLORATION PRODUCTS (U.S.A.), Inc., a Delaware
corporationBy:
    
    /s/ David L. RolandName:
    David L. RolandTitle:
    DirectorI/O MARINE SYSTEMS, INC., a Louisiana corporationBy:
    
    /s/ David L. RolandName:
    David L. RolandTitle:
    Vice President




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GUARANTORS OF FOREIGN LOANS:
CONCEPT SYSTEMS LIMITED, a private limited company
incorporated under the law of ScotlandBy:
    
    /s/ David L. RolandName:
    David L. RolandTitle:
    DirectorI/O CAYMAN ISLANDS, LTD, an Exempted
Company incorporated in the Cayman IslandsBy:
    
    /s/ David L. RolandName:
    David L. RolandTitle:
    DirectorION INTERNATIONAL HOLDINGS L.P.,
a Bermuda limited partnershipBy:
    ION Exploration Products (USA) Inc.,a Delaware corporation, its General PartnerBy:

/s/David L. RolandName: David L. RolandTitle:   DirectorSENSOR NEDERLAND B.V., a private company incorporated
under the laws of The NetherlandsBy:
    
    /s/ David L. RolandName:
    David L. RolandTitle:
    Director [Signature page to Sixth Amendment and Waiver to Credit Agreement]




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ARAM SYSTEMS CORPORATION,
a Nova Scotia unlimited corporationBy:
    
    /s/ David L. RolandName:
    David L. RolandTitle:
    Vice President




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ADMINISTRATIVE AGENT AND LENDER:
HSBC BANK USA, N.A.By:
    
    /s/ J. Gregory DavisName:
    J. Gregory DavisTitle:
    Senior Vice President




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LENDER:
HSBC BANK CANADABy:
    
    /s/ John SchmidtName:
    John SchmidtTitle:
    Account Manager, Energy FinancingBy:
    
    /s/ Kevin BaleName:
    Kevin BaleTitle:
    Assistant Vice President, Energy Financing




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LENDER:
ABN AMRO BANK N.V.By:
    
    /s/ Neil J. BivonaName:
    Neil J. BivonaTitle:
    Senior Vice PresidentBy:
    
    /s/ Parker H. DouglasName:
    Parker H. DouglasTitle:
    Senior Vice President




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LENDER:
CITIBANK, N.A.By:
    
    /s/ Faith E. AllenName:
    Faith E. AllenTitle:
    Senior Vice President




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LENDER:
WHITNEY NATIONAL BANKBy:
    
    /s/ Douglas WebsterName:
    Douglas WebsterTitle:
    Banking Officer




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LENDER:
PNC BANK, NATIONAL ASSOCIATIONBy:
    
    /s/ Holly KayName:
    Holly KayTitle:
    Vice President




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LENDER:
ABU DHABI INTERNATIONAL BANK INC.By:
    
    /s/ David J. YoungName:
    David J. YoungTitle:
    Vice PresidentBy:
    
    /s/ Nagy S. KoltaName:
    Nagy S. KoltaTitle:
    Executive Vice President




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NEW LENDER:
BANK OF CHINA, NEW YORK BRANCHBy:
    
    /s/ William Warren SmithName:
    William Warren SmithTitle:
    Chief Lending Officer




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SCHEDULE 2.01
 REVOLVING LOAN COMMITMENTS
 Lender
    
    Revolving Loan Commitments
    
    Term Loan CommitmentsHSBC Bank USA, N.A.
    
    $
    19,090,909.09
    
    
    $
    34,000,000ABN AMRO Bank, N.A.
    
    $
    19,090,909.09
    
    
    $
    34,000,000HSBC Bank Canada
    
    $
    9,090,909.09
    
    
    $
    30,000,000Citibank, N.A.
    
    $
    16,363,636.36
    
    
    $
    7,000,000Whitney National Bank
    
    $
    13,636,363.64
    
    
    $
    10,000,000PNC Bank, National Association
    
    $
    13,636,363.64
    
    
    $
    10,000,000Abu Dhabi International Bank Inc.
    
    $
    9,090,909.09
    
    
    $
    0Bank of China, New York Branch
    
    $
    40,000,000.00
    
    
    $
    0TOTAL
    
    $
    140,000,000
    
    
    $
    125,000,000