User manual EAGLE Z-9500 Operation Manual

[. . . ] Z-9500 INSTALLATION/OPERATION . 4 MANUAL LITHO IN U. S. A. 988-0119-26 EAGLET4 PDF compression, OCR, web-optimization with CVISION's PdfCompressor Copyright© 1990, 1991. 1992, Eagle Electronics. All rights reserved. WARNING! USE THIS LORAN RECEIVER ONLY AS AN AID TO NAVIGATION. A CAREFULNAVIGATOR NEVER RELIES ON ONLYONE METHOD TO OBTAIN POSITION INFORMATION. CAUTION This loran receiver, (like all loran navigation equipment) will show the shortest, most direct path to a waypoint. It provides navigation data to the waypoint regardless of obstructions. [. . . ] The graph portion graphically displays all echoes from the underwater world on the screen. The digital sonar displays numbers on thescreento show the depth of the bottom. It is an extremely complex and accurate device usingthe latest in software technology to elimihatefalse echoes and showonly thetrue bottomdepth. The Z-9500 has an correctionfeature that lets you change the ASF. Thisforcestheloran to use a new ASF instead of theone that resides in its memory. You can shift the ASF by changing the TD offset or by entering your actual latitude/longitude position. IMPORTANT!ASF corrections entered by the user are good only forthe stations in useat the time and locationbeing corrected. ASF correctionsmay not be usable if you change stations, or if the unit automatically changes stations. This especially holdstrue if you enter a latitude/ longitude positionto change ASF. The Z-9500 will only apply the ASF correctionto the stationsin use - not all of them. Remember, if you change stations, especially if you change GAl's, the ASF will have to be re-entered. However, any digital sonar can be. fooled. The sonar signal penetrates the surface clutter, hits the bottom and returns. There's a clear difference between the surface clutter and the bottom. The digital has no problem with these conditions. 0 10 Problems occur when the surface clutter extends to the bottom as shown on the right. The digital sonar cannot distinguish between surface clutter and the bottom and so it becomes "lost. " It may flash the last known bottom depth or it may lock onto an unrealistic depth such as 900 feet in a lake that only gets 60 feet deep at its deepest point. If the unit is in automatic, the auto-ranging feature may change the range to an extremely deep depth, such as 0 to 600 feet. This compresses the information on the display, making it difficultto read. The Z-9500 also has automatic ASF selection. TD's and latitude/longitude are automatically corrected whentheAutomatic ASF feature is on. However, not all areas in all GAl's are covered by the Automatic ASF feature, If you enable this featureand the ASF'saren't available in your area, a warningmessage appears in the message box. This menu lets you change the ASF using TD offsets or latitude/longitude correction, 94 The Z-9500is versatileenoughto handle these situations. The screen will clear and the Z-9500 will display sonar information again. Ifthere is a lot of "clutter"or random echoes on the screen, turn the sensitivity down until a definite bottom echo is seen. Once you're in deeper water, the digital and automatic featurescan be turned back on by simply pressing theAUTO key. 43 PDF compression, OCR, web-optimization with CVISION's PdfCompressor The Z-9500's digital has the capability of using the 192 kHz or 50 kHz frequency. [. . . ] If you're using a screen with the latitude/longitude displayed, the lat/long will flash until a new position displays. If the unit doesn't show the proper tatitude/ longitude position, you may have to change stations, then try switching the primaryand alternate solutions. · The solutioncurrentlyin use by theZ-9500is displayed at thetopof the positionscreen. Check your position against the loran after it displays a new latitude/ longitude. To switchback from the alternate to the primary solution, repeat the above steps. [. . . ]