ACORN INVESTMENT TRUST
SC 13G/A, 1998-02-05
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549


                                  SCHEDULE 13G



                   Under the Securities Exchange Act of 1934
                               (Amendment No. 2)*


                                 COMARCO Inc.
                      ------------------------------------
                                (Name of Issuer)

                         Common Stock, $.10 par value
                      ------------------------------------
                         (Title of Class of Securities)

                                   200080109
                                  -----------
                                 (CUSIP Number)


*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).

                               Page 1 of 5 Pages
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- -----------------------                                  ---------------------
CUSIP NO. 200080109                   13G                PAGE 2 OF 5 PAGES
- -----------------------                                  ---------------------

- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                                                                                
      Acorn Investment Trust, Series Designated Acorn Fund                     
      36-2962100          
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4                                 
      Massachusetts

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF            None
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          355,000
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             None
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                          355,000
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
      355,000
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
10           
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
      7.53%

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
12           
      IV

- ------------------------------------------------------------------------------
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Item 1(a)  Name of Issuer: COMARCO Inc.

Item 1(b)  Address of Issuer's Principal Executive Offices:
           22800 Savi Ranch Parkway, Suite 214
           Yorba Linda, CA 92808-1299

Item 2(a)  Name of Person Filing:
           Acorn Investment Trust, Series Designated Acorn Fund

Item 2(b)  Address of Principal Business Office:
           227 West Monroe Street, Suite 3000
           Chicago, Illinois 60606

Item 2(c)  Citizenship: The filing person is a Massachusetts business trust.

Item 2(d)  Title of Class of Securities: Common Stock, $.10 par value

Item 2(e)  CUSIP Number: 200080109

Item 3     Type of Person:
           (d) Investment company register under section 8 of the Investment
               Company Act.

Item 4     Ownership (at December 31, 1997):
           (a) Amount owned "beneficially" within the meaning of rule
               13d-3: 355,000 shares
           (b) Percent of class: 7.53% (based on 4,716,217 shares
               outstanding at 11/30/97)
           (c) Number of shares as to which such person has:
              (i)   sole power to vote or to direct the vote:  None
              (ii)  shared power to vote or to direct the vote: 355,000
              (iii) sole power to dispose or to direct the disposition
                    of:  None
              (iv)  shared power to dispose or to direct the disposition
                    of: 355,000

           Power over voting and disposition of the securities is shared with
           Wanger Asset Management, L.P. which is the investment advisor of
           Acorn Investment Trust, Series Designated Acorn Fund.


                               Page 3 of 5 pages
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Page 4 of 5 Pages


Item 5      Ownership of Five Percent or Less of a Class:

            If this statement is being filed to report the fact that as of the
            date hereof the reporting person has ceased to be the beneficial
            owner of more than five percent of the class of securities, check
            the following [_].

Item 6      Ownership of More than Five Percent on Behalf of Another Person:
            Not Applicable

Item 7      Identification and Classification of the Subsidiary Which Acquired
            the Security Being Reported on by the Parent Holding Company:
            Not Applicable

Item 8      Identification and Classification of Members of the Group:
            Not Applicable

Item 9      Notice of Dissolution of Group:
            Not Applicable

Item 10     Certification:

            By signing below I certify that, to the best of my knowledge and
belief, the securities referred to above were acquired in the ordinary course of
business and were not acquired for the purpose of and do not have the effect of
changing or influencing the control of the issuer of such securities and were
not acquired in connection with or as a participant in any transaction having
such purpose or effect.


                               Page 4 of 5 pages
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                                   Signature

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

Date: February 5, 1998

                                       ACORN INVESTMENT INVEST,
                                         SERIES DESIGNATED ACORN FUND
                          
                          
                                       By: /s/ Bruce H. Lauer
                                           ---------------------------
                                           Bruce H. Lauer
                                           Vice President and Treasurer

                               Page 5 of 5 pages


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