User manual FURUNO 1942 MARK-2

[. . . ] MARINE RADAR MODEL 1932 MARK-2/1942 MARK-2 C Yo u r L o c a l A g e n t / D e a l e r 9-52, Ashihara-cho, Nishinomiya, Japan Te l e p h o n e : Te l e f a x : 0 7 9 8 - 6 5 - 2 111 0798-65-4200 All rights reserved. Printed in Japan FIRST EDITION C : : A U G. OME-34620 (YOSH) MODEL1932/1942 MARK-2 SAFETY INSTRUCTIONS DANGER Stay away from transmitting scanner. The radar scanner emits microwave radiation which can be harmful to the human body, particularly the eyes. Never look directly into the scanner radiator from a distance of less than 1 m when the radar is in operation. Radio Frequency Radiation Hazard The radar scanner emits electromagnetic radio frequency (RF) energy which can be harmful, particularly to your eyes. Never look directly into the scanner aperture from a close distance while the radar is in operation or expose yourself to the transmitting scanner at a close distance. [. . . ] "G (OUT)" appears at the top right-hand corner when the Out alarm is selected. 3. 6 Selecting Pulsewidth Pulsewidth is the time in microseconds necessary to transmit a single radar pulse. The longer the pulsewidth the greater the direction range capability, however range accuracy and range resolution are reduced. Pulsewidth can be selected to short or long on the 1. 5 and 3 nautical mile ranges. Press the [MENU] key to close the menu. Dashed line: no alarm Guard zone IN ALARM OUT ALARM Figure 3-7 In and Out alarms Selecting guard zone type 1. Press the [MENU] key, select "OTHERS MENU, " and then press the [ACQ/ENTER] key. Guard Mode" and "In" (alarm on target entering zone) or "Out" (alarm on target exiting zone) by operating the omnipad. Press the [MENU] key to close the menu. 3. 7 Guard Alarm The guard alarm allows the operator to set the desired range and bearing for a guard zone. violate the guard zone an audible alarm sounds and the offending target blinks to call the operator's attention. Setting a guard zone 1. "*G (IN)" or "*G (OUT), " with asterisk blinking, appears at the top right-hand corner of the display. (The asterisk indicates the guard zone is partially set. ) CAUTION The guard alarm is a useful anti-collision aid, but does not relieve the operator of the responsibility to also keep a visual lookout for possible collision situations. The alarm should never be used as the sole means for detecting possible collision situations. 3-4 3. See Figure 3-8 (4). Asterisk blinking Guard zone to set A B D C * G (IN) A Notes on the guard alarm ¡ The alarm is a useful anti-collision aid, but does not relieve the operator of the responsibility to also keep a visual lookout for possible collision situations. ¡ When the radar range is less than one half of the guard zone range, the guard zone disappears and "G (IN)" or "G (OUT)" appears in inverse video. ¡ A target echo does not always mean a landmass, reef, ships or surface objects but can imply returns from sea surface or precipitation. As the level of these returns varies with environment, the operator should properly adjust the A/C SEA, A/C RAIN and GAIN to be sure the alarm system does not overlook target echoes. Drag cursor here. (1) Mentally create the guard zone to set. (2) Drag cursor to top left corner of zone and press [GUARD]. G (IN) Guard zone G (IN) C Drag cursor here. 3. 8 Watchman The watchman function periodically transmits the radar for one minute to check for targets in a guard zone. If it finds change in the zone from the previous transmission it transmits the radar continuously. This feature is useful when you do not need the radar's function continuously but want to be alerted to radar targets in a specific area. Tx 1 min Watchman starts. St-by 5, 10 or 20 min Tx 1 min St-by 5, 10 or 20 min (4) Guard zone completed. (3) Drag cursor to bottom right corner of zone and press [GUARD]. Figure 3-8 How to set the guard zone Silencing the audible alarm Any radar targets violating the guard zone will trigger the audible alarm. When this is done, "G(ACKN)" replaces "G(IN). " This means the alarm is acknowledged. This can be done at "20, Alm Sence Lv" on the "OTHER MENU. " Figure 3-9 How watchman works How watchman works When the time selected for the watchman rest period has elapsed, the radar automatically transmits for one minute to check the condition inside the guard zone. ("WATCHMAN" appears during stand-by. ) If there is change, the radar sounds the audible alarm, cancels the watchman function and transmits continuously. Cancelling the guard zone and guard alarm Press and hold down the [GUARD] key until the guard zone disappears. 3-5 Turning on watchman 1. Create a guard zone (usually 360 degrees) with the guard alarm function. [. . . ] It can be valuable to extend the vector length to evaluate the risk of collision with any target. 6. 7 Operational Warnings There are two main situations which cause the ARP-10 to trigger visual and audible alarms: · · CPA/TCPA alarm Lost target alarm CPA/TCPA alarm CAUTION The CPA/TCPA alarm feature should never be relied upon as a sole means for detecting the risk of collision. The navigator is not relieved of the responsibility to keep visual lookout for avoiding collisions, whether or not the radar or other plotting aid is in use. 6. 6 Past Position Display The Auto Plotter displays equally time-spaced dots (maximum five dots) marking the past positions of any targets being tracked. If it changes course, its plotted course will not be a straight line in TM mode. Press the [MENU] key. Visual and audible alarm are generated when the predicted CPA and TCPA of any target become less than their preset limits. [. . . ]