The utility model relates to a transparent fixing by horizontal angle board of navigation. Including a calibrated scale, evenly distributed has the round scale mark on the calibrated scale, the center of calibrated scale is fixed with a vertical pivot, install the transparent disc of transparent disc in rotatable centre and top in the pivot of calibrated scale top, be provided with a rhumb line of coinciding with the diameter on calibrated scale, the transparent disc of middle transparent disc and top respectively. Trade original transparent paper into the transparent disc, do not have the problem of extravagant paper again to accuracy of measurement is high. The pivot is the hollow shaft, and when utilizing transparent fixing by horizontal angle board to find accommodation point, the center of pivot can conveniently be passed to the centre bore position of pivot promptly with the pencil, do the mark to the accuracy has been increased.