EXHIBIT 31.2

                                  CERTIFICATION

        The undersigned, in his capacity as the Executive Vice President and
Chief Financial Officer of Motient Corporation, being the principal financial
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, Neil L. Hazard, 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, this 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 report;

        3.     Based on my knowledge, the financial statements, and other
financial information included in this 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 report;

        4.     The registrant's 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)) and internal control over
financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f))
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)  Designed such internal control over financial reporting, or
                    caused such internal control over financial reporting to be
                    designed under our supervision, to provide reasonable
                    assurance regarding the reliability of financial reporting
                    and the preparation of financial statements for external
                    purposes in accordance with generally accepted accounting
                    principles.

               (c)  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

               (d)  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 (the
                    registrant's fourth fiscal quarter in the case of an annual
                    report) that has materially affected, or is reasonably



                    likely to materially affect, the Company's internal control
                    over financial reporting; and

        5.     The registrant's 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/ Neil L. Hazard
                                          ------------------
                                          Neil L. Hazard

                                          Executive Vice President and Chief
                                          Financial Officer (principal financial
                                          officer)

                                          November 9, 2006