2010 ändrade marinen definitionen av geografiska områden för säker fart för re-spektive fartygsklass, d v s fartområden. Den nya regeln baseras på ett EU-direktiv för civila passagerarfartyg. Här beskriven utredning undersöker säkerhetseffekten av denna regel i förhållande till säkerhetsnivån i marinens verksamhet 1990–2015. Utredningen följer the International Maritime Organization (IMO:s) process för en Formal Safety Assessment (FSA). Risken i marinens verksamhet under perioden har inte varit försumbar, men analysen visar också att regeln som definierar farty-gens fartområden inte leder till säkerhetshöjningar som står i proportion till dess operativa kostnad. Identifierade lärdomar innebär att en FSA kan visa om en regel påverkar säkerhetsnivån som tänkt och hur den i övrigt påverkar verksamheten. Speciellt belyses behovet av att kunna analysera föreslagna bestämmelser i termer av säkerhetseffekt, men också i termer av lämplighet i förhållande verksamheten i stort.
In 2010, the Swedish Navy introduced a new rule re-defining the sea area of safe operation for respective classes of naval vessels. The new rule is based on an EU directive developed for civilian passenger ships. The described investigation examines the safety effects of this rule in relation to the safety level in the Swedish Navy. The investigation is conducted in accordance with the process defined by the International Maritime Organization (IMO) in the Formals Safety Assessment (FSA). The identified risk levels are compared to risk criteria from civilian shipping and to criteria developed specifically for the Swedish Navy with approaches as defined by the IMO. In the period studied, there have been safety issues leading to higher than negligible risks. However, the proactive analysis shows that the examined approach for limiting the sea areas of safe operations for the Swedish Navy is not cost effective. The lessons identified is that an analysis such as this can show if a regulation affects safety in the manner intended and if there are other means by which the regulation affects operations. An approach such as the FSA is useful and is also needed for organizations outside the traditional focus of the IMO. The investigation particularly highlights the need for an approach for analyzing the proposed safety changes in terms of both effectiveness and suitability. In general, it is therefore concluded that the proactive perspective of the FSA investigation can unearth principal aspects of how a rule affects the operation studied.