1.

Introduction

1.1

Reference is made to the Agreement. Terms used in this support letter extension (the "Extension Letter") shall, unless defined herein, have the same meaning ascribed to such terms in the Agreement.

1.2

Reference is also made to the interim utilisation letter dated 17 March 2017 (the "Interim Utilisation Letter"), under which we agreed to let you draw down USD 10,000,000 subject to certain terms as set out therein.

1.3

Reference is also made to the letter agreement dated 14 April 2017 (the “Support Letter”), under which we agreed to abstain from exercising any remedies in respect of the Enumerated Defaults (as defined therein) during the Support Period (as defined therein) on the terms contained in the Support Letter.

1.4

Reference is also made to the support letter extension dated 28 April 2017, under which we agreed to extend the Support Period to end on the earlier of (x) 11:59 p.m. (New York Time) 12 May 2017 or (y) the occurrence of any Early Termination Event (as defined in the Support Letter).

1.5

You have requested, and the Lender has agreed to abstain from exercising any remedies in respect of the Enumerated Defaults during the Extended Support Period (as defined below) on the terms contained in this Extension Letter.

2.

THE EXTENDED Support Period

2.1

During the Extended Support Period, the Lender hereby agrees to waive each Default and/or Event of Default which is an Enumerated Default (and, during the Extended Support Period, to abstain from exercising any rights or remedies under the Finance Documents as a result of any such Default and/or Event of Default which is an Enumerated Default).

2.2

The “Extended Support Period” is the period beginning on the date hereof and ending on the earlier of (x) 11:59 p.m. (New York Time) 21 May 2017 or (y) the occurrence of any Early Termination Event (as defined in the Support Letter).

3.

ENUMERATED DEFAULTS

4.

Conditions Precedent

4.1

The effectiveness of this Extension Letter is subject to the satisfaction, or waiver by the Lender, of the following conditions:

(a)

this Extension Letter shall be duly countersigned by the Borrower, the Parent Guarantor and the UK Guarantor;

(b)

the Parent Guarantor and the Borrower have confirmed, by countersigning this Extension Letter, their acceptance to the Lender engaging Bayard, P.A. as its Delaware local legal counsel, and that Borrower and the Parent Guarantor shall be jointly and severally liable for all legal fees and costs reasonably incurred by the Lender from such engagement;

(c)

the Parent Guarantor shall have paid, in cash, all outstanding costs and expenses of the Lender incurred prior to the date of this Extension Letter, including (i) all invoiced fees and disbursements of its legal advisors, Hughes Hubbard & Reed LLP, Advokatfirmaet Thommessen AS, and Ince & Co LLP (including the invoice dated 10 May 2017), (ii) all invoiced fees and expenses of Guggenheim Partners LLC (including the invoice dated 10 May 2017), and (iii) all agreed retainers of Bayard, P.A. (retainer being in the amount of $45,000); and

(d)

the Parent Guarantor shall have entered into extended forbearance or support agreements with respect to (i) the RBS Facility and (ii) the 2022 Notes, in each case, in form and substance reasonably acceptable to the Lender (each, a “Third Party Extended Forbearance Agreement”).

5.

TOLLING OF TIME PERIODS

6.

COUNTERPARTS

7.

GOVERNING LAW, JURISDICTION AND ENFORCEMENT

7.1

This Extension Letter and any non-contractual arrangements arising out of or in relation to it shall be governed by Norwegian law.

7.2

This Extension Letter shall be a Finance Document and Clause 31 (Governing law and enforcement) shall apply mutatis mutandis in respect of this Extension Letter

for and on behalf of

DNB Bank ASA

/s/ Andrew J. Shohet

/s/ Cathleen Buckley

Name: Andrew J. Shohet

Name: Cathleen Buckley

Title: Vice President

Title: Senior Vice President

For and on behalf of

GulfMark Rederi AS

/s/ Quintin V Kneen

_________________________

Name: Quintin V Kneen

Title: President & Chief Executive Officer

For and on behalf of

GulfMark Offshore, Inc.

/s/ J. Mitchell

_________________________

Name: J. Mitchell

Title: Executive Vice President & CFO

For and on behalf of

GulfMark UK Ltd.

/s/ J. Mitchell

_________________________

Name: J. Mitchell

Title: Executive Vice President & CFO