Chartwright makes a focused range of solid brass chartwork instruments: dividers in single-handed and straight-point patterns, in 7-inch and 8-inch sizes, plus a pencil compass.
The choice of size comes down to the chart formats you work with. The 8-inch suits larger folios; the 7-inch handles smaller chart formats more easily. Both are solid brass, which holds its setting well through a day's chartwork.
