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):




                 (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 2, 2005