Toms Chartwork Rules is an easy to follow downloadable PDF that guides you through the following practical chartwork problems: Allowing. Transferred position lines. Transferred position circles. Single alteration of course. Horizontal sextant angles. Vertical sextant angles. Counteracting. Luminous and geographic ranges. [gview file=”https://officerofthewatch.co.uk/wp-content/uploads/2016/03/Toms-Rules-for-Chartwork.pdf”]