If you’ve ever been reading a chart or plotting at night and blown your night vision, here’s a great tool from Weems & Plath – the Light Dividers. 
Put down that flashlight or headlamp and stop blinding your helmsman.  Instead, pick up a pair of these dividers when  doing your DR track.  These Weems & Plath LightDividers  have a red LED light built into each leg for use in low light conditions.

The center adjustment mechanism allows quick, precise operation and a spare point, lead and knob are provided.  Use them like any other dividers or as a compass. 
One CR1220 battery will last about 20 hours.  The dividers retail for around $36.99. 

For more information visit www.weems-plath.com