1 EXHIBIT 23.1 METRICOM, INC. CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS As independent public accountants, we hereby consent to the incorporation of our report included in this Form 10-K/A, into the Company's previously filed Registration Statements on Form S-8, File Nos. 33-47688, 33-63076, 33-63088, 33-81740, 33-91746, 33-95070, 333-09001, 333-09005, 333-18319,333-32211 and 333-62557 and on Form S-3, File Nos. 33-78286 and 333-15169. /s/ ARTHUR ANDERSEN LLP San Jose, California November 17, 1999