EXHIBIT 21 SUBSIDIARIES DATRON SYSTEMS INCORPORATED SUBSIDIARIES MARCH 31, 1999 Percentage of Jurisdiction Voting Securities in which Name Owned by Parent Incorporated - ----------------------------------- --------------- ------------- Datron World Communications Inc. 100% California Datron/Transco Inc. 100% California Datron Resources Inc. (a wholly owned subsidiary of Datron/Transco Inc.) 100% California Datron/Trans World Communications Int'l Ltd. (a Foreign Sales Corporation) 100% U.S. Virgin Islands