Tanner (AGS 15) - Naval Cruise Book

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'i QU, I coal Q if W fzfmalfzifafa Navigational charts are a prerequisite for the effectiveness of a marine force. The mission of the 'survey fleet is to collect the data which is presented on these navigational charts. Using modern methods ofelectronic positioningfsuch as lorac and shoranj, the tirst step in our survey operations is to accurately determine the geographic position of the antennae on the beach. This is the type of work we were doing as we sent parties ashore with Tellurometer Cdevice for measuring distancej and other instruments to Forur, Bani, Sirri, Musa, Tunb and Nabiyu Tunb Islands. The second step is normally a service of the Hydrographic Office, but this season TAN- NER manufactured her own boat 'sheets with imprinted lines of position in reference to the an- tennae. Determination of the position of TANNER and her soundboats anywhere in the area of the lorac or shoran net at the same instant that measurment of the depth of water is recorded on the fathometer in the next step, which is effected through use of a highly sensitives radio receiver with counter dials. Tide guages are installed at various locations in the area to determine the act- ual height of tide at the time of each sounding,and then the Soundings are corrected to show what the water depth will be at low tide, this is the value printed on a navigational chart. This is ne- cessary so that the mariner can depend on the water being as deep or deeper than charted. 'Ihere are numerous other small tasks performed during a survey season to provide other es- sential infonnation, but the determination of accurate depths and their location is our primary miss- ion.