Garmin GPSMAP 2006 Owner's Manual & Reference

Also see for GPSMAP 2006: Declaration of conformity Declaration of conformity Installation instructions Owner's manual Install guide

27ReferenceSonar Tab Settings• Water Type— since sound waves travel through ‘Fresh’ and ‘Salt’ water at different rates, it isnecessary to select the ‘Water Type’ to ensure accurate readings on the unit.• Depth Number— controls the efficiency of the digital depth update rate.’ Fast Update’ will updatequicker and is recommended for low-noise, deeper water (>50 ft.). ‘Auto’ is best for shallow wateror high noise areas, will have a slower screen update and is best used if you travel a wide variety ofdepths.If the unit is unable to track the bottom for any reason, the digits in the depth window willflash on and off to alert you that the unit is not tracking the bottom.• Dual Frequency Display— allows you to show 200kHz and 50kHz data either together or split onthe display. Choose ‘Merge’ to show both and ‘Split’ to separate the 200/50kHz data. Dual frequencymode combines both frequencies to get the best coverage area and contour/depth readings. Whenthe unit is set to ‘Dual’ and the Dual Frequency Display is set to ‘Merge’, the appearance of the fishsymbols (and simulated arches) will change. Fish returns from the center of the beam (200kHz) will besolid (or narrow arches), but the returns from the edges of the beam (50kHz) will be hollow (or widearches).• Scale— controls the depth ‘Scale’ displayed vertically along the right side of the chart. The depth‘Scale’ can be configured to display four different ways: as an ‘Overlay’, in the ‘Corners’, with ‘Basic’ or‘No Scale’.• Color Bar— shows a gradient scale of the current Target Level setting (see page 30).• Flasher— with the ‘Flasher’ active, a graphic Flasher representation will be displayed on the far rightside of the chart. This graphic Flasher displays structure and bottom returns much the same as a trueFlasher. You may find this feature particularly useful when using ‘Fish Symbols’.• Keel Offset— allows you to offset the surface reading for the depth of a keel. This makes it possible tomeasure depth from the bottom of your keel instead of from the transducer’s location. Enter a posi-tive number to offset for a keel. It is also possible to enter a negative number to compensate for a largevessel that may draw several feet of water. The ‘Keel Offset’ will be reflected in the depth reading.• Map Split Sonar Detail— controls Map Page sonar split range scale. ‘Full Range’ will show the entirescale of 2X or 4X right side split of the Sonar Page on the Map Page and data fields.‘Maximum Detail’ will display what is shown on the left side of a split Sonar Page on the Map Page anddata fields.You may display a Temp Log in a data field toshow a plot of the transducer temperature read-ing over a specified period of time.Transducer at SurfaceEnter (+) positivenumber to show depthfrom bottom of keelTransducer at Bottom of KeelEnter (-) negative number to showdepth from surface Keel Offset