A method of providing an indication of a level of attentiveness required for a user on a vessel, the vessel comprising a group of computers (28, 30, 32, 34, 36, 37) providing data of different types employed in the navigation of the vessel, the method being performed by an attentiveness indicator device in the vessel and comprising the steps of: - obtaining various types of vessel handling data from said computers (28, 30, 32, 34, 37), wherein the vessel handling data comprises internal vessel data and environmental data, where the environmental data is related to an area associated with the position of the vessel and comprises sea bed depth data, the vessel handling data comprises internal vessel data of one type and environmental data of a corresponding type, the method further comprising processing vessel handling data, said processing comprising comparing internal handling data and corresponding environmental data for obtaining aggregate vessel handling data, wherein one type of internal vessel handling data is an own course and a corresponding type of environmental data is surrounding vessel courses, where the aggregate vessel handling data for this type of internal vessel data comprises a count of the surrounding vessels having courses that cross the own course, - weighting vessel handling data in dependence of importance wherein at least some weights comprising a weight for the sea bed depth increase with the speed of the vessel, - combining the vessel handling data for obtaining an attentiveness value, - comparing the attentiveness value with at least one threshold, - assigning an attentiveness level to the attentiveness value based on the comparison, and - presenting the attentiveness level to the user in order to provide an indication of the attentiveness required. - obtaining various types of vessel handling data from said computers (28, 30, 32, 34, 37), wherein the vessel handling data comprises internal vessel data and environmental data, where the environmental data is related to an area associated with the position of the vessel and comprises sea bed depth data, the vessel handling data comprises internal vessel data of one type and environmental data of a corresponding type, the method further comprising processing vessel handling data, said processing comprising comparing internal handling data and corresponding environmental data for obtaining aggregate vessel handling data, wherein one type of internal vessel handling data is an own course and a corresponding type of environmental data is surrounding vessel courses, where the aggregate vessel handling data for this type of internal vessel data comprises a count of the surrounding vessels having courses that cross the own course, - weighting vessel handling data in dependence of importance wherein at least some weights comprising a weight for the sea bed depth increase with the speed of the vessel, - combining the vessel handling data for obtaining an attentiveness value, - comparing the attentiveness value with at least one threshold, - assigning an attentiveness level to the attentiveness value based on the comparison, and - presenting the attentiveness level to the user in order to provide an indication of the attentiveness required.