On the basis of climatological data (from 1911 to 1989) the authors have made the analysis of thermohaline values, their annual and vertical distribution in the Pag Bay and Velebitski channel, and also the analysis of synoptic data obtained from two oceanographic measurements in June 1989. The results show usual and nontypical conditions in the thermohaline structure in the water column. Explanation of phenomena are presented.

Due to its geographic position, geomorphology and certain signs of frequent occurrencesof atypical conditions, the south area of the southern part of the Kornati islands and the island of Žirje is very interesting for the thermohaline analysis. The analysis has not been completed,however, the activities necessary for getting an insight into justifiability and the need for radical interventions have been made. On the basis of the data obtained from longtime measurements, separate analyses of the sea water temperature, salinity and density have been made, defining annual courses of mean monthly and extreme values, mean monthly values at characteristic depths, and vertical distribution of mean monthly values. Special importance was given to external and internal influences.

Teškoće u provođenju postupaka za održavanje pomorskih karata i navigacijskih publikacija (reambulacija u procesima hidrografskih organizacija) izravno utječu na usklađenost podataka na pomorskim kartama i navigacijskim publikacijama sa stvarnim stanjem u naravi. Ovaj je rad pokušaj doprinosa povećanju djelotvornosti reambulacijskih postupaka i u konačnici, višem stupnju točnosti dokumenata u izravnoj službi sigurnosti plovidbe. Predlažu se stanovite promjene u neposrednom terenskom radu koji obuhvaća akvatorij hidrografske izmjere, te u djelatnostima hidrografskih služba u izboru i obradama podataka iz reambulacija. Doprinos praksi svakako je određivanje odnosa reambulacije i hidrografske izmjere. Primjeren prostor posvećuje se razgraničenju redovitih reambulacijskih i izvanrednih postupaka.Ključne riječi: reambulacija, hidrografija, izmjera, Contributions to Advancement of Updating Procedures of Sea Charts and Sea PubllicationsDifficulties in carrying out the revision procedures (reambulation in the hydrographic organisation processes) have a direct influence on the accordance of information on charts and nautical publications with the real situation in nature. This paper aims to help towards a greater effectiveness of revision procedures and finally to bring about a higher level of accuracy of documents related to the safety at sea. It proposes to introduce some changes in the field work covering the sea area of the hydrographic survey, as well as in the activities of hydrographic organizations when selecting and processing the revision data. A valuable contribution to the practice is that it determines the relation between revision and hydrographic survey. Due space is devoted to the determining of boundaries between regular revision procedures and additional procedures.Key words: reambulation, hydrography, survey UVODTema ovog rada su prijedlozi za unapređenje postupaka za održavanje pomorskih karata i navigacijskih publikacija (reambulacija; B. Klaić, 1986.), kojima koriste se hidrografske službe u provjeravanju stupnja podudarnosti podataka na pomorskim kartama i navigacijskim publikacijama sa stvarnim stanjem u prirodi. Temelj za izradu pomorske karte je, međunarodnim preporukama standardizirana hidrografska izmjera. Reambulacija je