Navman F400 Installation And Operation Manual

Also see for F400: User manual

Contents

Navman F400 Installation And Operation Manual Manual pdf 14 page image

14 NAVMAN Fishfinder User Manual• If the desired mode is Top or Bottom thenuse the V or the ^ key to adjust the limitvalue to the desired level• Press the key to accept the choiceand return to normal displayGain functionThe gain is a measure of ability to receive weaksignals. The higher the gain setting, the betterthe unit is able to pick up weak return signals.Deep water operation requires the gain to beset to a higher value due to loss of signal in thewater.There are two gain modes that can be selected,Manual and Auto.If Manual is selected then a gain setting from 0to 15 must also be entered. This will be thevalue of gain that is always used when displayinginformation on the screen. A low gain numbermay be suitable in shallow water but will need tobe increased for deep water operationIf Auto is selected then the gain will automaticallyvary as the water depth changes. This featureis particularly useful if you are fishing areaswhere the depth changes suddenly. In Automode, you can set the auto-gain value to providea consistent image of the bottom, regardless ofthe bottom type. A low auto-gain setting will causea thin bottom image to be displayed. A high auto-gain setting will result in a thick bottom image.This adjustment is particularly useful with a weakreturn signal from a muddy or silty bottom.Normally, in these conditions the auto-gain willincrease the gain to a level that may make thedisplay appear too cluttered, making it difficult todistinguish fish. In this situation the auto-gaincan be reduced to display a weak bottom imagebut with improved fish images.Setting the gain• Press the ∗ key until the gain menu isdisplayed• Press either the key or the key tomove the pointer to the desired mode ofoperation• If the desired mode is Manual then use theV or the ^ key to adjust the value to thedesired level• Press the key to accept the choiceand return to normal display mode• If the desired mode is Auto then use theV or the ^ key to adjust the value to thedesired level. In Auto mode the gain will becontrolled to show the same bottom detailirregardless of depth