Bita guía dinámica para barcos remolcadores.

Bita guía dinámica para barcos remolcadores que consiste en una máquina compuesta por dos cilindros situada en una estructura de arcos y con una pista por donde se desliza la guía, por la que pasará la línea de remolque del remolcador al buque remolcado, esta guía permite trabajar al remolcador normalmente y sin actuar dentro de los valores del tiro a punto fijo, en los que la línea de remolque se desliza sin problemas sobre la bita-guía, pero en las situaciones en que el tiro se eleva por encima de valores superiores al tiro a punto fijo del remolcador, cuando el remolque es de través, la guía se desplaza del centro a estribor o babor proporcionalmente al tiro y al efecto de alargamiento de la línea de remolque.Solicitud: 200200584 (04.03.2002)Nº Pub. de Solicitud: ES2264286A1 (16.12.2006)Nº de Patente: ES2264286B1 (01.11.2007

Aportación de las correcciones astronómicas a la precisión de la situación

Se analizan y proponen algunos cambios y mejoras que deberán introducirse en la navegación astronómica, si se desea que ésta mantenga algún interés hoy en día, cuando el cálculo de la situación de los buques ha pasado, casi exclusivamente, a los sistemas satelitarios. Aunque la Organización Marítima Internacional exige el mantenimiento en los planes de estudio para la formación de marinos y la práctica en la mar de la navegación astronómica, cuando se comparan los resultados de ésta con los del sistema de posicionamiento global GPS, surgen discrepancias que, en ocasiones, no contribuyen a que las técnicas tradicionales mantengan su bien ganado prestigio. Introduciendo el cálculo informático de las coordenadas celestes y de la situación, y aplicando métodos bien conocidos de Geodesia y Topografía, es posible que la astronomía de posición siga jugando un papel en la mar, si no ya preponderante, sí como valioso auxiliar y contraste de los métodos más modernos de posicionamiento de los buque

Assignation of resources for sea rescue. An application to the Basque Country

The problem of the location of sea rescue resources generates certain controversies which are generally revived after accidents which have had a great social impact. The aim of the present paper is to formulate a methodology based on gravity models allowing sea rescue resources to be assigned. To this end, a study has been made of the problems of accident assessment, of ports and airports and their relation with the above and of zonification. Finally, an empirical application of this methodology to the Basque Country has been mad

La proyección mercatoriana oblicua

This paper considers the possibility of using in the Electronic Chart the Oblique Mercator Projection, little used until now. We reach the conclusion that this projection can be used to represent the earth`s surface in a more realistic way without significantly altering the conformability of the projection. The advent of more powerful computers which make it possible to perform complex graphic calculations allow this type of projection to be use

Dynamic fairlead for towing winch

The patent deals with the problems existing between the towline and the fairlead and presents a dynamic variety of the last to compensate the lengthening of the towline and, therefore, reduce and even eliminate rope wear on abrasive surfaces. Tugs stability will increase during tow operations. The system is composed of structural elements as well as hydraulic component

Collision of fishing vessels: Lorenz curves and GINI indices

Fishing vessel collisions are accidents which, in most cases, give rise to other accidents such as explosions, water on board and even sinking. These are accidents which often have fatal consequences for the crews and in many cases signify the loss of the vessel. Such losses can be avoided or reduced if the fishing vessels are equipped with the appropriate technological means and their crews proceed correctly and promptly. Thus, national governments should include in their regulation of the fishing sector control mechanisms that guarantee that the vessels are endowed with the adequate resources and with crews well-trained in safety. These resources and their distribution must be assigned in accordance with the needs of the fleet, which requires an in-depth knowledge of the degree of concentration of accidentality by collision of the fishing sector of a country. In this context, the aim of this work is twofold: first, to formalise a methodology for the fishing sector of a country which allows the inequalities in the concentration of collisions to be analysed; and second, to apply this methodology to the Spanish fishing fleet for the period 1994-2002. Thus, indices are constructed by region and by fishing types for two variables: fishermen and fishing vessels. In these areas, results are then obtained both for the concentration of collisions and for their associated Lorenz curves. An increase in the enequalities in the spatial and functional distribution of these accidents is observe