These A4 whiteboards can be written on with waterproof markers pens such as our Pilotage Pens or Chart Pens.
These are ideal for taking into the cockpit as pilotage notes for the helm or naviagtor.
Totally waterproof and heavy enough not to blow away in the wind.
Can be cleaned with common solvents such as Surgical Spirit.
(Image shows a standard A4 Whiteboard and a Hinged A4 Whiteboard, Pilotage Pens and Solvent)