Lowrance HDS-7 Gen2 Touch Operation Manual - Page 65
Frequency, Logging Structure data
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Palette Several display palettes with varying degrees of color and brightness are available. Contrast Adjusts the brightness ratio between light and dark areas of the screen, making it easier to distinguish objects from the background. Water column Turns on/off the viewing of the StructureScan water column on StructureMap (only applicable in Live mode). Frequency StructureScan supports two frequencies. 455 kHz has excellent resolution and greater range, while 800 kHz provides better definition at shallower depths. Noise Rejection Monitors the effects noise (boat pumps, water conditions, engine ignition systems, etc.) has on your display, and then filters out undesired signals. Logging Structure data To record structure data, steer your boat over an area and select Log Sonar from the Structure options menu. ¼¼ NOTE: For best results, we recommend turning off Auto Range when recording a structure sonar log (.sl2). Converting files To create a StructureMap file you must convert a structure sonar log (.sl2) file to StructureMap format (.smf ). This can be done automatically from the Sonar Log menu, or manually by converting logs from the Files menu. Due to the large size of StructureMap StructureMap | Lowrance HDS Gen2 Touch | 63