Quote:

‘707 Captain’ FLIGHT MANUAL Part II – Aircraft and Systems (cs707_manual2.pdf) page 22 - L17. DOPPLER-INS SWITCH My guess is you did not switch the DOPPLER-INS SWITCH from DOPPLER to INS. ;) Mark

I figured it out. I forgot to engage it on the overhead panel.

This plane using doppler navigation combined with CINA INS is amazing! I've been flying it non-stop for about a month.

Thanks for the great answer!!