Exhibit 23.1
Consent of Independent Registered Public Accounting Firm
We consent to the incorporation by reference in the following registration statements of TeleCommunication Systems, Inc. of our report dated March 22, 2005, with respect to management’s assessment of the effectiveness of internal control over financial reporting, and the effectiveness of internal control over financial reporting of TeleCommunication Systems, Inc., included in this Annual Report (Form 10-K/A) for the year ended December 31, 2004:
Registration Statement on Form S-3:
| Registration Number | Date Filed | |||
| 333-119341, as amended | December 8, 2004 | |||
| 333-112759, as amended | April 9, 2004 | |||
| 333-104305 | April 4, 2003 | |||
Registration Statements on Form S-8: | ||||
| Name | Registration Number | Date Filed | ||
| TeleCommunication Systems, Inc. Fourth Amended and Restated 1997 Stock Incentive Plan | 333-118610 | August 27, 2004 | ||
| TeleCommunication Systems, Inc. Third Amended and Restated 1997 Stock Incentive Plan | 333-107466 | July 30, 2003 | ||
| TeleCommunication Systems, Inc. Amended and Restated 1997 Stock Incentive Plan | 333-66676 | August 3, 2001 | ||
| Xypoint Corporation 2000 Stock Plan Xypoint Corporation 1997 Stock Plan, as amended Xypoint Corporation 1995 Stock Option Plan | 333-51656 | February 26, 2001 | ||
| TeleCommunication Systems, Inc. Amended and Restated 1997 Stock Incentive Plan and TeleCommunication Systems, Inc. Employee Stock Purchase Plan | 333-48026 | October 16, 2000 |
/s/ Ernst & Young LLP
Baltimore, Maryland
March 22, 2005
