130 GPSMAP 496 Owner’s ManualsettIng uP And usIng sonAr > vIeWIng the sonAr teMPerAture tAbViewing the Sonar Temperature TabnotE: You must be receiving proper sonar data from anotherdevice, such as a Garmin GSD 20 or GSD 21 Sounder Module,to view temperature information.The Temperature sub tab provides a visual graph of watertemperature changes over a period of time. The graph reads fromright to left, so that the most recent temperature measured is shownon the far right side of the graph. The dotted lines within the graphindicate intervals in the temperature scale and the duration of time.notE: Select tEMp for the tranSDUCEr type in the SonarSetup. See “Setting Up the Sonar Page” on page 124 for moreinformation.Press MEnU twice to open the Main Menu. Select Sonar from thevertical row of tabs on the left, then select temperature from therow of tabs along the top of the screen.Changing the Temperature ScreenThe graph adjusts and shows the temperature changes according tothe temperature Scale and time Duration settings.temperature Scale—select the degree span from the list. Selectauto to have the unit automatically determine the best range, orselect a span of 2, 4, 6, 8 or 10 degrees.time Duration—set how fast or slow the temperature log scrolls; ashorter time duration means a faster temperature log scroll. Select aduration from 1 minute to 2.5 hours.Reset the Temperature GraphTo reset the scale range for the temperature graph, press MEnU,highlight reset auto Scale, and press EntEr. This is usefulwhen the scale spans a large range due to extreme temperaturechanges. You can only reset the scale when you select auto for thetemperature Scale.To restore the temperature graph to defaults, press MEnU, highlightrestore Default, and press EntEr.Temperature Tab
