Made-to-measure boat mattress
from the bow to the cabin.

Measure the base the mattress will lie on, not your old mattress.C = how far the corner is bevelled along the edge, the same distance on both sides (45°).Both corners at the foot end are bevelled the same distance: C along each edge (45°).R = radius of the rounded corner. Not sure? Lay a tape measure along both edges and measure where the curve begins.One curve across the full width. B = length to the furthest point, in the middle. R = radius of the curve: the larger R, the flatter it is; R = ½ A gives a semicircle.Foam without cover, with semicircular ends. A = width, B = length. A different shape? Add a photo or drawing.The part on the port side (left when facing forward). A = length of the straight side, B = width at the bottom, C = the outer side from the bottom corner to the bend, D = the angled side from the bend to the tip.The part on the starboard side (right when looking forward). A = length of the straight side, B = width at the bottom, C = the outer side from the bottom corner to the bend, D = the angled side from the bend to the tip.Two mirror images, split in the middle: one part on the port side and one on the starboard side. A, C and D apply to one part; B is the total width at the bottom of both parts together. A = length of the straight side, B = width at the bottom, C = the outer side from the bottom corner to the bend, D = the angled side from the bend to the tip.Measure the diameter through the centre, at the widest point.Send a photo or drawing of your shape. You can fill in the largest width and length, but you don’t have to.