EXHIBIT 23.1 CONSENT OF DELOITTE AND TOUCHE LLP, INDEPENDENT AUDITORS INDEPENDENT AUDITORS' CONSENT We consent to the incorporation by reference in Registration Statement No. 333-53141 of Boatracs, Inc. on Form S-8 of our report dated July 31, 1998 on the financial statements of Enerdyne Technologies, Inc., appearing in this Amendment No. 2 to Current Report on Form 8-K/A of Boatracs, Inc. filed on or about November 18, 1998. /s/ DELOITTE AND TOUCHE LLP San Diego, California November 18, 1998