Garmin GPSMAP 178 Owner's Manual

Also see for GPSMAP 178 Sounder: Specifications

Contents

Garmin GPSMAP 178 Owner's Manual Manual pdf 24 page image

Getting StartedMap/Sonar Split &Sonar PagesMap/Sonar Split PageThe Map/Sonar Split Page combines the Map Page on the left half with the Sonar Page on the right bydefault. You may adjust the size of the split (pg 32). Press PAGE key to proceed to the Sonar Page.Sonar PageThe Sonar Page is where your GPSMAP 178/178C Sounder becomes a powerful fishfinder. The topleft of the screen contains data fields, while the Adjustment Bar above the data fields allows direct accessto the settings most commonly changed while using the Sonar Page. The middle of the page contains aright-to-left moving sonar image of the water beneath your boat (Items appear as they pass under yourtransducer. Those items on the right side of the screen are closer to you than those on the left.). Along theright side of the screen is an adjustable scale which reflects the depth of the area being displayed. If theunit does not detect a transducer attached to the unit, a “Sonar Turned Off” message appears across theSonar Page. You may also show a sonar flasher and color bar on the right side.The sonar display may also be set to show a split screen view of a zoomed portion of the sonar,bottom lock (display scaled from the bottom up), or a combination of these options (see pg. 34). Forexample, you may choose to show dual frequency at a 2X zoom (Dual 2X) on one half and normal rangedual frequency (Dual) returns on the other half. The current display mode is displayed at the bottom ofeach sonar display.(172C) Sonar returns show as red (strongest), then oranges (strong), yellows (medium), greens(weaker) and blues (weakest). (172) The stronger sonar returns are darker, weaker returns are displayedin a lighter shade of gray. The ‘Fish Symbols’ option (see page 38) allows you to view the actual sonardata, a fish symbol, or a combination of both. ‘Fish Symbols’ appear as green (172C), or dark gray (172).When the unit is set to ‘Dual’ frequency (see page 35), the appearance of the fish symbols (and simulatedfish returns) changes. Fish symbols from the narrower beam (200kHz) are solid (or narrow returns), butthe symbols from the wider beam (50kHz) are hollow (or wide returns). Fish icons are displayed in threedifferent sizes. Actual fish returns may not always appear as perfect arches, due to the speed, fish orienta-tion, and/or other conditions.More on understanding the Sonar Page may be found on page 33 and in Appendix G.Dual frequency returnsSonar PageData FieldsDepthScaleAdjustmentMenuSimulatedFish ArchBottomThermoclineCenter beamreturnOuter edgebeam returnsFrequencymodeFlasher