On long distance audax rides the route is given as a series of instructions such as “Left at T, sp Beulah”.
The route is written down on the routesheet. The rider has to be able to read the routesheet easily. To make this happen, the bike has a routesheet holder on the bars. Well, that’s the way I do it. Some people tie the routesheet to their arm. Some people convert it to a GPS track.
Here is my incredible high tech routesheet holder
This is made from two layers of correx. Someone gave me a sheet of correx they had lying around but any correx will do. Estate agents use it for “for sale” signs.
The holder has two layers one with the grain of the correx going front to back and one side to side. This perpendicular arrangement makes the board more rigid. Considering it weights almost nothing it is quite strong. The two layers are joined at the top and bottom by duct tape.
To attach to the stem or bars, punch holes in the lower layer of correx with a knife. The holes should be apart either side of the underlying bars or stem. Then feed a cable tie through one hole and out the other.
The latest improvement to this design is to use reusable cable ties so the holder can go on a different bike or come on and off easily.