I'll fly overseas in near future. i have to get some more experience in flying 707. fuel, fuel-efficient power settings, etc. and then i'll do some crossings :) i'll go for doppler nav first. i flew kpdx - phnl 2 or 3 weeks ago. doppler gives enough precision. i was able to arrive within vor range. offset was about 15 nm, but still good for 5-6 hrs flight.