Promoted to commander on 1 January 1890, Jackson became commanding officer of the torpedo school training ship HMS Defiance at Wearde Quay near Saltash in January 1895: at the school he established an early reputation as a pioneer of ship-to-ship wireless technology.
Dipromosikan menjadi komandan pada tanggal 1 Januari 1890, Jackson menjadi perwira kapal sekolah pelatihan torpedo HMS Defiance di Dermaga Wearde dekat Saltash pada Januari 1895: di sekolah ia mendirikan reputasi sebagai pelopor dari tekhnologi nirkabel antarkapal.