From Deb at HB ...

QUOTE=HBirdDeborahCRC;5741277]On the SI unit Jiggin Mode is a selection in the 2D Sonar Express Menu. It allows the user to select the sonar ping pattern for use while vertical jigging. When turned ON the ping pattern will be: 200 kHz, Left SI Beam, Right SI Beam, 83 kHz, repeat. With this mode turned OFF the ping pattern will be: 200 kHz, Left SI Beam, Right SI Beam, 83 kHz, Left SI Beam, Right SI Beam, repeat. Basically this feature prioritizes the 2D beam over the SI beam.[/QUOTE]