== Notes ==
*A Dioptra dioptra is a somewhat difficult item to make. Assuming you use a [[protractor]] of about equal quality to your blacksmithing skill , it can be created with as low as 30 skill in blacksmithing skill. It is recommended to improve the protractor first before you try to create it.*The protractor QL affects the unfinished Dioptra quality and ultimately the finished qualitycreation chance.*Quality of Dioptra dioptra affects how long you can plan a bridge.
*The maximum number of tiles is "quality x 0.4" rounded up. In other words, the minimum QL needed per tile is "tile * 2.5". This calculation is both for survey and planning.
*Starter compass can be used.
*The Dioptra dioptra has a relatively high value and is worth the same as, for example, mooring ropes and door locks of equal quality. [[Get price]] = QL^2 * 0.50.
=== Known Creation Chances creation chances ===
Quality of protractor affects creation chance.