James R. Hagerty                                  888 17th Street NW, Suite 1000
jhagerty@kalbianhagerty.com                                Washington, DC  20006

(202) 223-5600 Telephone
(202) 223-6625 Facsimile

                                        March 1, 2006

Northeast Securities, Inc.
100 Wall Street, 8th Floor
New York, New York 10005

                  Re: GSE Systems, Inc., a Delaware Corporation

Ladies and Gentlemen:

     This firm has acted as counsel to GSE Systems, Inc., a Delaware Corporation
(the  "Company")  in connection  with the offering of units  consisting of up to
$4,250,000 of 8% Cumulative Convertible Preferred Stock and Warrants to Purchase
Shares of Common Stock (the "Private Placement").

     For  purposes  of this  opinion  letter,  we have  examined  copies  of the
following documents (the "Documents"):

     1.   Executed copy of the  confirmation  letter from Northeast  Securities,
          Inc. ("NESC") and the Company  confirming the Company's  engagement of
          NESC as financial advisor and syndicate  placement agent in connection
          with the Private Placement (the "Placement Agreement");

     2.   Certificate of  Incorporation  of the Company,  as amended through the
          date hereof;

     3.   Bylaws of the Company as amended through the date hereof;

     4.   Certificate  of Good  Standing for the Company  issued by the State of
          Delaware;

     5.   Certificate  of Good  Standing for the Company  issued by the State of
          Maryland;

     6.   Resolutions  of the Board of  Directors of the Company with respect to
          the transactions referred to herein;

     7.   The stock  ledger and minute book of the Company as  certified  by the
          Secretary of the Company as complete, accurate and in effect as of the
          date hereof;

     8.   A certificate of the Secretary of the Company, dated March 1, 2006, as
          to the incumbency and signatures of certain officers of the Company;

     9.   A certificate of a certain officer of the Company, dated March 1, 2006
          as to certain facts relating to the Company;

     10.  Executed  copy of the  Amended  Private  Placement  Memorandum,  dated
          February 27, 2006 (the "PPM");

     11.  Executed  copy of the  Certificate  of  Designation,  Preferences  and
          Rights  of  Series  A  Cumulative   Convertible   Preferred  Stock  by
          Resolution of the Board of Directors of the Company (the  "Certificate
          of Designation");

     12.  Executed copy of the Subscription Agreement by and between the Company
          and each  individual  investor  in the units  offered  in the  Private
          Placement (the "Subscription Agreement");

     13.  Executed copy of the Subscription Documents Booklet by and between the
          Company  and each  individual  investor  in the units  offered  in the
          Private Placement (the "Subscription Booklet");

     14.  Executed copy of the Registration  Rights Agreement by and between the
          Company and each investor,  who has executed a Subscription  Agreement
          with the Company (the "Registration Rights Agreement");

     15.  Executed copy of the  additional  letter  agreement by and between the
          Company and NESC in which the Company provides certain representations
          and warranties to NES (the "NESC Letter Agreement");

     16.  Executed copy of the Warrant to Purchase Shares of Common Stock by and
          between  the Company  and each  investor  in the units  offered in the
          Private Placement (the "Warrant"); and

     17.  Executed copy of the Warrant to Purchase  Share of Common Stock by and
          between the Company and NESC (the "NESC Warrant" and together with the
          warrant  described above in Paragraph 15 and any warrants  issuable by
          the  Company if its  misses two  consecutive  dividend  payments,  the
          "Warrants");

     The PPM, the Placement  Agreement,  the  Certificate  of  Designation,  the
Subscription  Agreement,  the  Subscription  Booklet,  the  Registration  Rights
Agreement,  the NESC Letter  Agreement,  the  Warrant  and the NESC  Warrant are
hereinafter   referred  to   individually   as  a  "Transaction   Document"  and
collectively  as  the  "Transaction   Documents."

     In our examination of the Transaction Documents and the other Documents, we
have  assumed  the  genuineness  of all  signatures,  the legal  capacity of all
natural  persons,  the accuracy and  completeness  of all of the Documents,  the
authenticity  of all originals of the Documents and the  conformity to authentic
originals  of  all  of  the  Documents  submitted  to  us as  copies  (including
telecopies). As to matters of fact relevant to the opinions expressed herein, we
have relied on the representations and statements of fact made in the Documents,
we have not  independently  established  the facts so relied on, and we have not
made any  investigation  or inquiry other than our examination of the Documents.
The opinion letter is given, and all statements  herein are made, in the context
of the foregoing.

     In addition to the above stated  assumptions and limitations,  the opinions
which  follow  are  subject  to  the  following   additional   assumptions   and
limitations:

     1.   The  undersigned  has  assumed  the  organization,   existence,   good
          standing,  qualification  (to do business)  and capacity of NESC,  and
          that the NESC has the right,  power and  authority  to enter into this
          transaction;

     2.   The  undersigned  has assumed that all documents  executed by NESC and
          each individual  investors in the units,  have, in fact, been executed
          by such  party or its duly  authorized  representatives  and that each
          natural person signing one or more of the Documents is competent;

     3.   The  undersigned  has assumed that there has been no mutual mistake of
          fact or  misunderstanding  or  fraud,  duress or undue  influence,  in
          connection  with  the  negotiation,   execution  or  delivery  of  the
          Transaction  Documents,   and  the  conduct  of  all  parties  to  the
          Transaction  Documents  has  complied  with any  requirements  of good
          faith, fair dealing and conscionability;

     4.   There  are and have been no  agreements  or  understandings  among the
          parties,  written or oral, and there is and has been no usage of trade
          or  course of prior  dealings  among the  parties  to the  Transaction
          Documents that would,  in either case,  define,  supplement or qualify
          the terms of the Transaction Documents; and

     5.   This opinion letter is based as to matters of law solely on applicable
          provisions of the following, as currently in effect: (i) United States
          Federal  Law;  (ii)  the  General  Corporation  Law  of the  State  of
          Maryland;  and  (iii)  the  General  Corporation  Law of the  State of
          Delaware.

     Based upon such  examinations  and the assumptions  and limitations  stated
above,  and in the  undersigned's  capacity  as  counsel  for the  Company,  the
undersigned is of the opinion that:

     1.   The Company is a corporation,  duly organized, validly existing and in
          good standing under the laws of the State of Delaware, and possess all
          requisite  power and  authority  to own  property  and to carry on its
          respective businesses;

     2.   The Company is duly qualified and in good standing to do business as a
          foreign corporation in Maryland;

     3.   The Company has full and  requisite  corporate  power and authority to
          execute,  deliver and perform its  obligations  under the  Transaction
          Documents,  including the power and authority to issue the Convertible
          Preferred   Stock  (as  that  term  is  defined  in  the   Transaction
          Documents),  the Warrants, and the common stock issuable upon exercise
          of the Warrants (collectively, the "Warrant Shares");

     4.   The Company has the  corporate  power to execute,  deliver and perform
          each  of  the  Transaction  Documents.  The  execution,  delivery  and
          performance by the Company of each of the  Transaction  Documents have
          been duly authorized by all necessary corporate action of the Company;

     5.   Each of the Transaction Documents has been duly executed and delivered
          on  behalf  of  the  Company  and  constitutes  a  valid  and  binding
          obligation  of  the  Company,   enforceable  against  the  Company  in
          accordance  with its terms.  Neither the execution of the  Transaction
          Documents nor the issuance of the  Convertible  Preferred  Stock,  the
          Warrants  or  the  Warrant  Shares  will  be  subject  to  contractual
          preemptive  rights. The Preferred Stock and the Warrants are, and when
          issued the Warrant Shares will be, duly and validly issued, fully paid
          and  non-assessable,  and free of any liens,  encumbrances and similar
          rights.  The Preferred  Stock,  Warrants and Warrant  Shares have been
          duly  authorized and reserved for issuance by all necessary  corporate
          action on the part of the Company;

     6.   Based solely upon the officer's certificate  identified in Paragraph 9
          of the Document listings above, there are, to our knowledge and except
          as set  forth  in the  Transaction  Documents  no  actions,  suits  or
          proceedings pending or threatened against the Company before any court
          or administrative  agency where such action,  suit or proceeding:  (a)
          either  individually or in the aggregate  would have material  adverse
          effect on the business, assets,  liabilities,  financial condition, or
          results of the operations of the Company;  (b) calls into question the
          validity of any of the Transaction Documents or any action taken or to
          be taken pursuant thereto; or (c) seeks to prevent the consummation of
          the transactions contemplated by the Transaction Documents;

     7.   No  approval or consent of, or  registration,  filing or other  action
          with any state or federal  governmental  authority,  is required to be
          obtained  or made  by the  Company  under  applicable  federal  law or
          applicable  state law in connection  with the execution,  delivery and
          performance  on  the  date  hereof  by  the  Company  of  each  of the
          Transaction  Documents,  except for (a) the authorizations  which have
          previously been obtained, taken or made and (b) filings such as may be
          required  to  be  filed  pursuant  to  applicable  federal  and  state
          securities  laws subsequent to the  consummation  of the  transactions
          contemplated by the Transaction Documents;

     8.   Neither the  execution  and  delivery of, nor the  performance  by the
          Company of its obligations under the Transactions Documents, including
          without  limitation,  the  Company's  issuance  and  delivery  of  the
          Convertible   Preferred  Stock,   Warrants  and  Warrant  Shares:  (a)
          violates,  conflicts with, or results in a breach or default under any
          provision of the Certificate of Incorporation,  as amended through the
          date  hereof,  or Bylaws of the Company,  (b)  violates any  judgment,
          decree, governmental order, statute, law, rule or regulations to which
          the Company is subject  (other than  ordinances  and  regulations,  or
          counties,  and  political  subdivisions  thereof),  including  without
          limitation,   any  applicable  state  law  pertaining  to  permissible
          interest  rates,  or (c) results in a violation,  breach or default by
          the Company (or gives rise to any right of  termination,  cancellation
          or  acceleration)  under  conditions  or  provisions  of any  material
          agreement;

     9.   No  taxes,  fees  or  other  charges,  including  without  limitation,
          intangible,  documentary, stamp, mortgage, transfer or recording taxes
          or similar charges are payable to any  governmental or regulatory body
          on account of the  execution,  delivery or ownership of the  Preferred
          Stock, the Warrants or the Warrant Shares;

     10.  The offering,  issuance and sale of the Preferred Stock,  Warrants and
          Warrant Shares under the circumstances contemplated by the Transaction
          Documents   are  exempt  from  all   registration   or   qualification
          requirements of applicable Federal and state securities laws;

     11.  The Company is not an "investment  company" or a company  "controlled"
          by an  "investment  company"  within  the  meaning  of the  Investment
          Company Act of 1940, as amended;

     12.  The  authorized  capital  stock of the Company is as  described in the
          Transaction  Documents.  All issued and  outstanding  shares of Common
          Stock of the Company have been duly authorized and validly issued, and
          are fully paid and nonassessable and free of any preemptive or similar
          rights.  To our knowledge,  except for rights  described in the PPM or
          the  incorporated SEC filings,  there are no other options,  warrants,
          conversion   privileges  or  other  rights  presently  outstanding  to
          purchase or otherwise  acquire any authorized  but unissued  shares of
          capital  stock  or  other  securities  of the  Company,  or any  other
          agreements to issue any such  securities of the Company,  or any other
          agreements to issue any such securities or rights; and

     13.  Nothing has come to our  attention  that has caused us to believe that
          the PPM, at the date thereof,  or any of the Company's  public filings
          with the Securities and Exchange  Commission (the "SEC"),  at the date
          they were  filed  with the SEC,  contained  an untrue  statement  of a
          material  fact or  omitted  to state a material  fact  required  to be
          stated  therein  or  necessary  to make  the  statements  therein  not
          misleading  or that the PPM or such  filings with the SEC, at the date
          thereof or at the date of closing of the Private  Placement,  included
          or includes an untrue statement of a material fact or omitted or omits
          to state a material  fact  necessary  in order to make the  statements
          therein, in the light of the circumstances under which they were made,
          not misleading.

     The foregoing  opinions are limited in all respects and for all purposes to
applicable federal and state laws (excluding the principles of  conflict-of-laws
or  choice-of-laws)  as presently in effect.  To the extent the matters  covered
hereby relate to the laws of any other  jurisdiction,  the  undersigned  has not
consulted  with legal  counsel who are experts with respect to such laws and the
undersigned  expresses  no  opinion  on the laws of such  jurisdiction(s)  might
affect the opinions expressed in this opinion letter.

     The undersigned  assumes no obligation to supplement this opinion letter if
any of the  applicable  laws  (statutory,  decisional  or  other)  or any of the
underlying facts or circumstances changes in any way. This opinion is based upon
and relies upon the current status of law and in all respects is subject to, and
may be  limited  by,  future  legislation  as well as by  developing  case laws,
statutes,  ordinances,  rules and regulations and facts,  all as in existence on
this date, and the  undersigned  expresses no opinion as to the effect which any
future amendments,  changes,  additions,  or modifications thereof may have upon
the future performance or enforceability of the Loan.

     While this opinion letter is given as of the date hereof,  it is based upon
certifications of various facts as of the dates referenced  herein, and does not
cover any  matters  arising at any time  subsequent  thereto,  unless  otherwise
expressly  stated  herein.  Nothing  has  come  to the  undersigned's  attention
subsequent  to the date hereof which should cause the  undersigned  to doubt the
continued state of facts as therein certified.

     The foregoing  opinions are limited to matters  expressly set forth herein,
and no  opinions  are to be  implied  or may be  inferred  beyond  the  opinions
expressly so stated.  The foregoing  opinions are legal opinions only and do not
constitute a guaranty or warranty of matters discussed therein.

     In addition to the qualifications, exceptions and limitations elsewhere set
forth in this opinion letter,  our opinions  expressed above are also subject to
the  effect  of:  (1) bankruptcy,   insolvency,  reorganization,   receivership,
moratorium  and other  laws  affecting  creditors'  rights  (including,  without
limitation,   the  effect  of  statutory  and  other  law  regarding  fraudulent
conveyances,  fraudulent  transfers  and  preferential  transfers);  and (2) the
exercise of judicial  discretion  and the  application  of principles of equity,
good  faith,  fair  dealing,  reasonableness,  conscionability  and  materiality
(regardless of whether the applicable  agreements are considered in a proceeding
in equity or at law).  We assume no  obligation  to advise you of any changes in
the foregoing subsequent to the delivery of this opinion letter.

     This opinion  shall run solely to Northeast  Securities,  Inc, its counsel,
and the  investors in the units  described in the  Transaction  Documents.  This
opinion  letter  may not be quoted or relied on (or claim of  reliance)  by, nor
copies  delivered to, any other person or used for any other purpose without the
express prior written consent of the undersigned in each instance.


                                KALBIAN HAGERTY, LLP


                                By:/s/ James R. Hagerty, Esq.
                                _____________________________
                                Name: James R. Hagerty, Esq.