Thanks for the tips.
Will try them tonight.
I've been doing pretty well with just noon sights for latitude, dead reckoning, using the radio beacons, using an almanac and timepiece, but those only get you so far.
I get that DIY navigation isn't for everybody, but it sure adds to the immersion factor if you have the time and patience to do it. Also makes the whole intercept process on radio contacts a lot more interesting when you have to count on yourself to know where to even start from in your calculations.