F5-E (or the One-Meter) is the smallest class sailed in the NAVIGA S section. It is a design-class, which means, that the rules are rather strict. Everything not explicitely allowed is forbidden. One of the main goals behind this limitation is to keep the costs low.

As the name implies the main characteristics of E-boats is the hull length of 1 meter. The general dimensions of the different sail and rigg sizes are given. The weight of an E-boat is 4 kg or more, with a lower limit of 4 kg.

F5-E has grown in popularity in the last years, since they are cheaper then other classes and also easier to transport.