Which capital cities are furthest from the nearest capitals that lie northwest of them?
Every time you guess an answer, you are shown the closest capital northwest of the following answer (ie a capital that you reach following a bearing between 225º and 45º)
I used 'rhombus' bearing, ie you keep following the same bearing throughout the journey even though it means not going in a straight line. Not sure how you got 38 degrees but perhaps that's the bearing you follow at the beginning of a straight line Ottawa-Reykjavik journey?