Exhibit 23.1 CONSENT OF INDEPENDENT ACCOUNTANTS We hereby consent to the incorporation by reference in the Registration Statement of GSE Systems, Inc. on Form S-8 (No. 333-08805) of our report dated February 29, 2000, except for Note 19, as to which date is March 23, 2000, relating to the financial statements of GSE Systems, Inc., which are included in this Annual Report on Form 10-K for the year ended December 31, 1999. /s/ PricewaterhouseCoopers LLP PricewaterhouseCoopers LLP McLean,Virginia March 30, 2000 X-23.1-1