Good time for an upgrade.
I would replace it with the XHS 9 HDSI 180 T. That's the transducer he comes with the 900 &1100 models and is a much better unit.
The XHS 9 HDSI 180 T is the standard
one for both 898's.
It's the 899 that comes with the Compact SI transducer.
Humminbird Helix 12 CHIRP SI, 1198c SI, 1198c SI, ONIX 10 SI NT, Helix 7 CHIRP SI GPS G2, 360, RC-1