The 'luxuries of life'

Mapping mileage wheel
Available from various electronics and motor sport outlets, these gadgets can be set for the scale of the map and by rolling the wheel along the mapped road the distance from and to any given points can be read directly. Sometimes useful for when a clue indicates that the next point is x km from one you have worked out but there could be a couple of solutions only differentiated by a small variance in distance.

Storage
You need somewhere to stow those tools and not just floating around in the car, stuffed in the glovebox or worst of all, in you pockets.

A decent quality flat bag like an oversized document case with three or four full size compartments and one or two smaller front pockets is ideal.