What is the difference between the Humminbird 999 ci HD SI and the 999 ci HD SI combo and how do you tell if you have the combo without powering unit up?
What is the difference between the Humminbird 999 ci HD SI and the 999 ci HD SI combo and how do you tell if you have the combo without powering unit up?
There is no difference.
All SI units are a combo of sonar and GPS
The Helix units have GPS in the name rather than Combo
Wayne Purdum
Charlottesville, Va.
Helix 12 CHIRP MEGA+ SI G3N/G4N, Helix 15 CHIRP MEGA SI+ GPS G4N
SOLIX 12 SI/G3, Helix 8 CHIRP MEGA SI+ G4N, Ultrex 80/LINK, MEGA360,
MEGA LIVE, LIVE TL
Awesome! Thanks for the reply!