There has never been a 1198c HD SI Combo. If you see that model advertised, it is an error or ignorance.
The only version is the 1198c SI Combo.
Great unit, I have two of them.
Edited by Wayne P. (08/04/15 08:40 AM)
Humminbird Helix 12 CHIRP SI, 1198c SI, 1198c SI, ONIX 10 SI NT, Helix 7 CHIRP SI GPS G2, 360, RC-1