Hi Alex.

From page 22 of 707 manual II - Aircraft and Systems - L17 Doppler-INS Switch. It reads (in part):

DOPPLER
- Autopilot in NAV mode tracks Doppler Navigation System
- Heading Bug on Captain's HSI controlled by HSI Heading Selector
INS
Inop if Delco Carousel IV-A INS is not installed.
If installed:
- Autopilot in NAV mode tracks CIVA INS
- Heading Bug on Captain's HSI controlled by CIVA INS

See the image for what it looks like. Click to open the cover and then click the switch and make sure it is in the DOWN position.

Mark

---