User manual SIMRAD ITI TWIN RIG QUICK REFERENCE GUIDE REV A

[. . . ] In the Trawl setup menu, the values for Trawl width, Spread1 and Spread2 should be set to their actual values in order to achieve correct graphical presentation. In the same menu, the Offset value must be changed if the clump will not be on line between the doors. The intention is to bring the blue clump value to zero when the trawls are going correctly through the water. [. . . ] The Spread 1 & 2, Temp/Depth, Trawl eye and Height 2 sensors must be set to an update rate of 1:1. Choosing Catch 1&2&3 in the same menu must correspond to the actual sensors placed on the trawl. The update rate of the Catch sensors is then for example set to 1:3 for update every third interrogaton lap. On which trawl the different catch sensors are fitted (port or starboard) are thereafter set in the same menu. The location of the Temp-Depth sensor is also chosen here. The remaining sensors have fixed locations. Update rate When the sensors are correctly set up, they can be turned on using the following command sequence: Main menu Rate On This sequence controls the complete system's update rate. With the rate set to maximum, the update speed will only depend on the number of sensors in use. When the rate is switched off, all transmitters in the system will be inactive. RATE MAX 0. 5 MIN 1. 0 MIN 1. 5 MIN OFF 857-165137 / Rev. A / February 2005 Max range In order to achieve the best possible update rate, the maximum range to the trawl is set using the following command sequence: Main menu System setup Max range You can choose any value between 400 and 4000 meters. If this range is set too low, the communication with the sensors beyond this distance will cease. If it is set too high, the system might use more time than necessary searching after sensors. MAX RANGE 2500m typically be the Depth/Temp, Spread 2, Height 2 and Catch 3 sensors. Notice that the Spread 1 sensor is set to port in the same menu (if it is used). Set the mode to Single trawl using the following command sequence: Main menu Trawl setup TrawlGear Single When you shoot the trawl, do remember to turn the rate on. Changing from single to twin Move the sensor Spread Remote 1 from the starboard door to port side of the clump. Place a Spread 2 sensor in the starboard door. Set the mode to Dual using the following command sequence: Main menu Trawl setup TrawlGear Dual Activate all the sensors using the following command sequence: Main menu Active sensors Sensors in use will typically include the Depth/Temp, Spread 2, Height 2, and Catch 3 sensors. [. . . ] To accept the changes when a GPS is not connected, set the last line, Set, to Yes. DATE SETTING UTC = LOCAL + h + - m, sign of h YEAR MONTH DATE HOUR MINUTE SECOND SET 0 0 2005 2 23 15 14 0 NO H G C D E F Units Units are set using the following command sequence: Main menu System setup Units Choose between meter; fathoms; yards; brazzia horizontally, and meter; feet; fathoms; brazzia vertically. Changing from twin to single The Spread 2 sensor placed in starboard door during twin trawl must be replaced with a Spread Remote 1. This is the sensor placed in port side of the clump during twin trawling. [. . . ]