Navigation and Seamanship

2.2.9. How to use the pelorus

                                                                       

1.- Stay near the helmsman, set the lubberline and the pelorus pivot on a plain parallel to the centre line of thevessel.

2.- Loosen both rings and set thegraduated pelorus rose on the same course of the vessel indicated by thehelmsman.

3.- Adjust the small rings in order to fixthe rose.

4.- Look for a reference point that isplotted on your nautical chart. Line up the forward and aft transit sights seesbelow, with the object to be plotted (e.g. lighthouse, building,etc.)

5.- When the helmsman indicates the vesselis on course or calls out "Mark", note the relevant reading ofthemarked object.

6.- In order to obtain a bearing, identifya second object following the instructions given previously.