EXHIBIT 31.1

                                  CERTIFICATION

     The undersigned, in his capacity as the Executive Vice President, Chief
Operating Officer and Treasurer of Motient Corporation, being the principal
executive officer, as the case may be, provides the following certification
required by 18 U.S.C. Section 1350, as adopted pursuant to Section 302 of the
Sarbanes-Oxley Act of 2002.

     I, Christopher W. Downie, hereby certify that:


     1.   I have reviewed this amended quarterly report on Form 10-Q/A of
          Motient Corporation, a Delaware corporation;

     2.   Based on my knowledge, this amended quarterly report does not contain
          any untrue statement of a material fact or omit to state a material
          fact necessary to make the statements made, in light of the
          circumstances under which such statements were made, not misleading
          with respect to the period covered by this quarterly report;

     3.   Based on my knowledge, the financial statements, and other financial
          information included in this quarterly report, fairly present in all
          material respects the financial condition, results of operations and
          cash flows of the registrant as of, and for, the periods presented in
          this quarterly report;

     4.   The other certifying officer and I are responsible for establishing
          and maintaining disclosure controls and procedures (as defined in
          Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and
          have:

          (a)  Designed such disclosure controls and procedures, or caused such
               disclosure controls and procedures to be designed under our
               supervision, to ensure that material information relating to the
               registrant, including its consolidated subsidiaries, is made
               known to us by others within those entities, particularly during
               the period in which this report is being prepared;

          (b)  Evaluated the effectiveness of the registrant's disclosure
               controls and procedures and presented in this report our
               conclusions about the effectiveness of the disclosure controls
               and procedures, as of the end of the period covered by this
               report based on such evaluation; and

          (c)  Disclosed in this report any change in the registrant's internal
               control over financial reporting that occurred during the
               registrant's most recent fiscal quarter that has materially
               affected, or is reasonably likely to materially affect, the
               registrant's internal control over financial reporting; and

     5.   The other certifying officer and I have disclosed, based on my most
          recent evaluation of internal control over financial reporting, to the
          registrant's auditors and the audit committee of the registrant's
          board of directors (or persons performing the equivalent functions):

          (a)  All significant deficiencies and material weaknesses in the
               design or operation of internal control over financial reporting
               which are reasonably likely to adversely affect the registrant's
               ability to record, process, summarize and report financial
               information; and

          (b)  Any fraud, whether or not material, that involves management or
               other employees who have a significant role in the registrant's
               internal control over financial reporting.


                                 /s/ Christopher W. Downie
                                 ----------------------------------------------
                                 Christopher W. Downie
                                 Executive Vice President, Chief Operating
                                 Officer and Treasurer (principal executive
                                 officer)

                                 May 23, 2005