I made life unnecessarily hard for myself on this one. When I looked at the map, I saw the summit was not too far from a named geographical feature, the Church of Prophet Ilias (warning: one many of churches of Prophet Ilias on the island) so I figured that it would make sense to navigate there first and then follow back roads to the summit (the pink route on the map below). That ended up working, but is not the most efficient way to the summit.
