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 quarterly report on Form 10-Q of Motient
Corporation, a Delaware corporation;

         2.    Based on my knowledge, 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):


                                       1



               (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)

                                        November 9, 2005


                                       2