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        <ReturnReference>SCHEDULE D, PAGE 1, PART II, LINE 9</ReturnReference>
        <Explanation>THE STATE OF MARYLAND RETAINS A HISTORICAL EASEMENT ON A SMALL BOAT SHED. THE SMALL BOAT SHED IS REPORTED ON THE STATEMENT OF FINANCIAL POSITION AT COST AND IS DEPRECIATED OVER ITS ESTIMATED USEFUL LIFE BY A LEVEL CHARGE (STRAIGHT-LINE METHOD) TO FIXED ASSET FUND EXPENDITURES. THE SMALL BOAT SHED IS FULLY DEPRECIATED AS OF 4/30/13.</Explanation>
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        <Identifier>TERMS FOR NOT REPORTING ASSETS PER SFAS 116</Identifier>
        <ReturnReference>SCHEDULE D, PAGE 1, PART III, LINE 1A</ReturnReference>
        <Explanation>THE COLLECTION, WHICH HAS BEEN ACQUIRED THROUGH PURCHASES AND CONTRIBUTIONS SINCE THE MUSEUM'S INCEPTION, IS NOT RECOGNIZED AS AN ASSET ON THE STATEMENTS OF FINANCIAL POSITION. PURCHASES OF COLLECTION ITEMS ARE RECORDED AS DECREASES IN UNRESTRICTED NET ASSETS IF THE ASSETS USED TO PURCHASE THE ITEMS ARE ACQUIRED, OR AS TEMPORARILY OR PERMANENTLY RESTRICTED NET ASSETS IF THE ASSETS USED TO PURCHASE THE ITEMS ARE RESTRICTED BY DONORS. CONTRIBUTED COLLECTION ITEMS ARE NOT REFLECTED ON THE FINANCIAL STATEMENTS. PROCEEDS FROM DEACCESSIONS OR INSURANCE RECOVERIES ARE REFLECTED AS CHANGES IN THE APPROPRIATE NET ASSET CLASSES.</Explanation>
      </Form990ScheduleDPartXIII>
      <Form990ScheduleDPartXIII>
        <Identifier>INTENDED USES FOR ENDOWMENT FUNDS</Identifier>
        <ReturnReference>SCHEDULE D, PAGE 2, PART V, LINE 4</ReturnReference>
        <Explanation>THE ENDOWMENT IS INTENDED TO BE USED FOR THE OBJECTIVES AND PURPOSES OF THE MUSEUM. NAMED FUNDS ARE ESTABLISHED WITHIN THE ENDOWMENT TO FIT SPECIFIC PURPOSES SUCH AS WATERFOWL, MAINTENANCE, LIGHTHOUSE, EDUCATION ETC., WHICH MEET THESE PURPOSES AND OBJECTIVES.</Explanation>
      </Form990ScheduleDPartXIII>
      <Form990ScheduleDPartXIII>
        <Identifier>LIABILITY UNDER FIN 48 FOOTNOTE</Identifier>
        <ReturnReference>SCHEDULE D, PAGE 3, PART X</ReturnReference>
        <Explanation>THE MUSEUM ADOPTED FASB ASC 740, WHICH PRESENTED A COMPREHENSIVE MODEL FOR HOW AN ENTITY SHOULD MEASURE, RECOGNIZE, PRESENT AND DISCLOSE IN ITS FINANCIAL STATEMENTS UNCERTAIN TAX POSITIONS THAT THE MUSEUM HAS TAKEN OR EXPECTS TO TAKE ON A TAX RETURN AS OF MAY 1, 2009. UNDER THIS STANDARD, THE MUSEUM RECOGNIZES THE TAX BENEFITS FROM UNCERTAIN TAX POSITIONS ONLY IF IT IS MORE LIKELY THAN NOT THAT THE TAX POSITION WILL BE SUSTAINED ON EXAMINATION BY THE TAXING AUTHORITIES, BASED ON THE TECHNICAL MERITS OF THE POSITION. THE TAX BENEFITS RECOGNIZED IN THE FINANCIAL STATEMENTS FROM SUCH POSITION ARE MEASURED BASED ON THE LARGEST BENEFIT THAT HAS A GREATER THAN 50 PERCENT LIKELIHOOD OF BEING REALIZED UPON ULTIMATE SETTLEMENT. FOR THE YEARS ENDED APRIL 30, 2013 AND 2012, THE MUSEUM HAS DOCUMENTED ITS CONSIDERATION OF FASB ASC 740-10 AND DETERMINED THAT NO MATERIAL UNCERTAIN POSITIONS QUALIFY FOR EITHER RECOGNITION OR DISCLOSURE IN THE FINANCIAL STATEMENTS. THE MUSEUM'S INCOME TAX FILINGS ARE SUBJECT TO AUDIT BY THE IRS AND MARYLAND. THE MUSEUM'S OPEN AUDIT PERIODS ARE 2010-2012.</Explanation>
      </Form990ScheduleDPartXIII>
      <Form990ScheduleDPartXIII>
        <Identifier>REVENUE AMOUNTS INCLUDED IN FINANCIALS - OTHER</Identifier>
        <ReturnReference>SCHEDULE D, PAGE 4, PART XI, LINE 2D</ReturnReference>
        <Explanation>SPECIAL EVENT, NETTED ON RETURN 118,434 RENTAL EXPENSES, NETTED ON RETURN 254,327</Explanation>
      </Form990ScheduleDPartXIII>
      <Form990ScheduleDPartXIII>
        <Identifier>EXPENSE AMOUNTS INCLUDED IN FINANCIALS - OTHER</Identifier>
        <ReturnReference>SCHEDULE D, PAGE 4, PART XII, LINE 2D</ReturnReference>
        <Explanation>SPECIAL EVENT, NETTED ON RETURN 118,434 RENTAL EXPENSES, NETTED ON RETURN 254,327</Explanation>
      </Form990ScheduleDPartXIII>
    </IRS990ScheduleD>
    <IRS990ScheduleG documentId="RetDoc6">
      <EventsInformation>
        <NameOfEvent1>BOATING PARTY</NameOfEvent1>
        <GrossReceiptsEvent1>225572</GrossReceiptsEvent1>
        <CharitableContributionsEvent1>111750</CharitableContributionsEvent1>
        <GrossRevenueEvent1>113822</GrossRevenueEvent1>
        <RentFacilityCostsEvent1>38052</RentFacilityCostsEvent1>
        <FoodAndBeverageEvent1>59953</FoodAndBeverageEvent1>
        <EntertainmentEvent1>2800</EntertainmentEvent1>
        <OtherDirectExpensesEvent1>15383</OtherDirectExpensesEvent1>
        <NameOfEvent2>CONCOURS D'ELEG</NameOfEvent2>
        <GrossReceiptsEvent2>31892</GrossReceiptsEvent2>
        <GrossRevenueEvent2>31892</GrossRevenueEvent2>
        <FoodAndBeverageEvent2>1027</FoodAndBeverageEvent2>
        <OtherDirectExpensesEvent2>1219</OtherDirectExpensesEvent2>
        <GrossReceiptsTotal>257464</GrossReceiptsTotal>
        <CharitableContributionsTotal>111750</CharitableContributionsTotal>
        <GrossRevenueTotalEvents>145714</GrossRevenueTotalEvents>
        <RentFacilityCostsTotalEvents>38052</RentFacilityCostsTotalEvents>
        <FoodAndBeverageTotalEvents>60980</FoodAndBeverageTotalEvents>
        <EntertainmentTotalEvents>2800</EntertainmentTotalEvents>
        <OtherDirectExpensesTotalEvents>16602</OtherDirectExpensesTotalEvents>
        <DirectExpenseSummaryEvents>118434</DirectExpenseSummaryEvents>
        <NetIncomeSummary>27280</NetIncomeSummary>
      </EventsInformation>
    </IRS990ScheduleG>
    <IRS990ScheduleM documentId="RetDoc7">
      <BoatsAndPlanes>
        <NonCashCheckbox>X</NonCashCheckbox>
        <NumberOfContributions>102</NumberOfContributions>
        <NoncashContribsRptdF990>345816</NoncashContribsRptdF990>
        <MethodOfDeterminingRevenues>SELLING PRICE OF DONATION</MethodOfDeterminingRevenues>
      </BoatsAndPlanes>
      <SecuritiesPubliclyTraded>
        <NonCashCheckbox>X</NonCashCheckbox>
        <NumberOfContributions>6</NumberOfContributions>
        <NoncashContribsRptdF990>108361</NoncashContribsRptdF990>
        <MethodOfDeterminingRevenues>SELLING PRICE OF DONATION</MethodOfDeterminingRevenues>
      </SecuritiesPubliclyTraded>
      <NumberOf8283Received>1</NumberOf8283Received>
      <AnyPropertyThatMustBeHeld>false</AnyPropertyThatMustBeHeld>
      <ReviewProcessUnusualNCGifts>true</ReviewProcessUnusualNCGifts>
      <ThirdPartiesUsed>false</ThirdPartiesUsed>
    </IRS990ScheduleM>
    <IRS990ScheduleO documentId="RetDoc8">
      <GeneralExplanation>
        <Identifier>ORGANIZATION'S MISSION</Identifier>
        <ReturnReference>FORM 990 - ORGANIZATION'S MISSION</ReturnReference>
        <Explanation>THE MISSION OF THE CHESAPEAKE BAY MARITIME MUSEUM IS TO INSPIRE AN UNDERSTANDING OF AND APPRECIATION FOR THE RICH MARITIME HERITAGE OF THE CHESAPEAKE BAY AND ITS TIDAL REACHES, TOGETHER WITH THE ARTIFACTS, CULTURES, AND CONNECTIONS BETWEEN THIS PLACE AND ITS PEOPLE. THE VISION OF THE CHESAPEAKE BAY MARITIME MUSEUM IS TO BE THE PREMIER MARITIME MUSEUM FOR STUDYING, EXHIBITING, PRESERVING, AND CELEBRATING THE IMPORTANT HISTORY AND CULTURE OF THE LARGEST ESTUARY IN THE UNITED STATES, THE CHESAPEAKE BAY. CBMM IS ACKNOWLEDGED AS A LEADING CENTER FOR EDUCATION, EXHIBITION, AND PRESERVATION OF CHESAPEAKE BAY MARITIME CULTURES. CBMM INSPIRES CULTURAL STEWARDSHIP BY PRESERVING, DOCUMENTING, AND SHARING STORIES, ARTIFACTS, SKILLS, AND THE TRADITIONS OF THE GENERATIONS OF PEOPLE WHO HAVE LIVED AND WORKED IN THE CHESAPEAKE BAY REGION. CBMM EMPHASIZES HOW THE CONNECTIONS BETWEEN PEOPLE AND THE BAY'S NATURAL ENVIRONMENT HAVE SHAPED UNIQUE, TRADITIONAL CULTURES. CBMM PROVIDES OPPORTUNITIES FOR VISITORS TO MAKE CONNECTIONS BETWEEN PAST HUMAN ACTIVITIES, PRESENT CONDITIONS, AND FUTURE POSSIBILITIES.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>ELECTION OF MEMBERS AND THEIR RIGHTS</Identifier>
        <ReturnReference>FORM 990, PAGE 6, PART VI, LINE 7A</ReturnReference>
        <Explanation>THE BOARD OF GOVERNORS, WHO ARE ALSO MEMBERS, ARE THE ONLY BODY THAT HAS THE AUTHORITY TO ELECT NEW GOVERNORS.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>ORGANIZATION'S PROCESS USED TO REVIEW FORM 990</Identifier>
        <ReturnReference>FORM 990, PAGE 6, PART VI, LINE 11B</ReturnReference>
        <Explanation>A DRAFT OF FORM 990 IS PROVIDED BY THE ORGANIZATION'S RETURN PREPARER TO THE ORGANIZATION'S VICE PRESIDENT OF FINANCE WHO REVIEWS THE DRAFT WITH THE BOARD AND FORWARDS ANY CHANGES TO THE PREPARER.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>ENFORCEMENT OF CONFLICTS POLICY</Identifier>
        <ReturnReference>FORM 990, PAGE 6, PART VI, LINE 12C</ReturnReference>
        <Explanation>BOARD MEMBERS ARE REQUIRED ONCE A YEAR TO COMPLETE A CONFLICT OF INTEREST FORM DISCLOSING ANY RELATIONSHIPS WITH THE MUSEUM, NEW BOARD MEMBERS AND KEY EMPLOYEES ARE ALSO REQUIRED TO COMPLETE THIS FORM.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>COMPENSATION PROCESS FOR TOP OFFICIAL</Identifier>
        <ReturnReference>FORM 990, PAGE 6, PART VI, LINE 15A</ReturnReference>
        <Explanation>EACH FISCAL YEAR, PREFERABLY NOT CONTEMPORANEOUSLY WITH THE PERFORMANCE REVIEW, THE CHAIR, IN CONSULTATION WITH THE EXECUTIVE COMMITTEE, SHALL SET THE COMPENSATION OF THE PRESIDENT AND CEO FOR THE ENSUING 12 MONTHS. IN DOING SO, THE CHAIR SHALL TAKE INTO ACCOUNT PERFORMANCE, TENURE, CHANGES IN THE COST-OF-LIVING INDEX, COMPENSATION OF COMPARABLE NOT-FOR-PROFIT ORGANIZATIONS, THE FINANCIAL CONDITION OF CBMM AND SUCH OTHER FACTORS AS THE CHAIR AND THE EXECUTIVE COMMITTEE MAY DEEM APPROPRIATE. EXCEPT IN EXTRAORDINARY CIRCUMSTANCES AND THEN ONLY IF APPROVED BY THE BOARD OF GOVERNORS, THE COMPENSATION OF THE PRESIDENT AND CEO SHALL NOT EXCEED THE RANGE OF COMPENSATION OF THE CEO OF COMPARABLE ORGANIZATIONS, AS SET FORTH IN THE MOST RECENT COMPENSATION REPORT OF CHARITY NAVIGATOR OR OTHER INDEPENDENT ENTITY THAT GATHERS AND REPORTS ON THE COMPENSATION OF CEO'S OF NOT-FOR-PROFIT ORGANIZATIONS.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>GOVERNING DOCUMENTS DISCLOSURE EXPLANATION</Identifier>
        <ReturnReference>FORM 990, PAGE 6, PART VI, LINE 19</ReturnReference>
        <Explanation>ITEMS MENTIONED IN LINE 19 ARE AVAILABLE UPON REQUEST. ANNUAL REPORT IS ON THE ORGANIZATION'S WEBSITE.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>RECONCILIATION OF CHANGES - OTHER</Identifier>
        <ReturnReference>FORM 990, PART XI, LINE 9</ReturnReference>
        <Explanation>SPECIAL EVENT, NETTED ON RETURN 118,434 RENTAL EXPENSES, NETTED ON RETURN 254,327 SPECIAL EVENT, NETTED ON RETURN -118,434 RENTAL EXPENSES, NETTED ON RETURN -254,327</Explanation>
      </GeneralExplanation>
    </IRS990ScheduleO>
  </ReturnData>
</Return>