Garmin GPSMAP 7400 Series Owner's Manual

Also see for GPSMAP 8000 Series: Owner's manual Quick start manual Instructions Owner's manual Installation instructions

Contents

Garmin GPSMAP 7400 Series Owner's Manual Manual pdf 30 page image

Adjusting Sea Clutter on the Radar Screen AutomaticallyYou can set the chartplotter to automatically adjust theappearance of clutter caused by choppy sea conditions.NOTE: Depending upon the radar in use, the sea clutter settingconfigured for use in one radar mode may or may not be appliedto other radar modes or to the radar overlay.NOTE: Not all options and settings are available on all radar andchartplotter models.1 From a radar screen or the radar overlay, select Menu >Noise Rejection > Sea Clutter.2 Select Presets or Auto.3 Select a setting that reflects the present sea conditions.When using a compatible radar model, the chartplotter adjuststhe sea clutter based on the sea conditions automatically.Adjusting Sea Clutter on the Radar Screen ManuallyYou can adjust the appearance of clutter caused by choppy seaconditions. The sea clutter setting affects the appearance ofnearby clutter and targets more than it affects the appearance ofdistant clutter and targets. A higher sea clutter setting reducesthe appearance of clutter caused by nearby waves, but it canalso reduce or eliminate the appearance of nearby targets.NOTE: Depending upon the radar in use, the sea clutter settingconfigured for use in one radar mode may or may not be appliedto other radar modes or to the radar overlay.1 From a radar screen or the radar overlay, select Menu >Noise Rejection > Sea Clutter.2 Select Up or Down to adjust the appearance of sea clutteruntil other targets are clearly visible on the radar screen.Clutter caused by sea conditions may still be visible.Adjusting Rain Clutter on the Radar ScreenYou can adjust the appearance of clutter caused by rain.Reducing the radar range also can minimize rain clutter(Zooming In and Out of the Radar Screen).The rain clutter setting affects the appearance of nearby rainclutter and targets more than it affects the appearance of distantrain clutter and targets. A higher rain clutter setting reduces theappearance of clutter caused by nearby rain, but it can alsoreduce or eliminate the appearance of nearby targets.NOTE: Depending upon the radar in use, the rain clutter settingsconfigured for use in one radar mode may or may not be appliedto other radar modes or to the Radar overlay.1 From a Radar screen or the Radar overlay, select Menu >Noise Rejection > Rain Clutter.2 Select Up or Down to decrease or increase the appearanceof nearby rain clutter until other targets are clearly visible onthe Radar screen.Clutter caused by rain may still be visible.Reducing Cross Talk Clutter on the Radar ScreenYou can reduce the appearance of clutter caused byinterference from another nearby radar source, when the CrossTalk Reject setting is on.NOTE: Depending upon the radar in use, the crosstalk settingconfigured for use in one radar mode may or may not be appliedto other radar modes or to the Radar overlay.From a Radar screen or the Radar overlay, select Menu >Noise Rejection > Crosstalk Rej..Echo TrailsThe echo trails feature enables you to track the movement ofvessels on the radar display. You can change the length of timethe trail is displayed.NOTE: Depending upon the radar in use, the settings configuredfor use in one radar mode may or may not be applied to otherradar modes or to the radar overlay.NOTE: Not all options and settings are available on all radar andchartplotter models.Turning on Echo TrailsFrom a radar screen or the radar overlay, select Menu >Radar Setup > Echo Trails > Display.Adjusting the Length of the Echo Trails1 From a radar screen or the radar overlay, select Menu >Radar Setup > Echo Trails > Time.2 Select the length of the trail.Clearing the Echo TrailsYou can remove the echo trails from the radar screen to reducethe clutter the screen.From a radar screen or the radar overlay, select Clear Trails.Radar Display SettingsFrom any Radar screen or the Radar overlay, select Menu >Radar Setup.Orientation: Sets the perspective of the radar display. Theorientation setting applies to every radar mode. This settingdoes not apply to the Radar overlay.Appearance: Sets the color scheme, look-ahead speed, andnavigation appearance.Front of Boat: Compensates for the physical location of theradar scanner on a boat, if the radar scanner does not alignwith the bow-stern axis.Radar Appearance SettingsFrom a Radar screen, select Menu > Radar Setup >Appearance.NOTE: These settings do not apply to the Radar overlay.Color Scheme: Sets the color scheme.Look-Ahead Speed: Shifts your present location toward thebottom of the screen automatically as your speed increases.Enter your top speed for the best results.Heading Line: Shows an extension from the bow of the boat inthe direction of travel on the radar screen.Rings: Shows the range rings that help you to visualizedistances on the radar screen.Nav Lines: Shows the navigation lines that indicate the courseyou have set using Route To, Guide To, or Go To.Waypoints: Shows waypoints on the radar screen.Front-of-Boat OffsetThe front-of-boat offset compensates for the physical location ofthe radar scanner on a boat, if the radar scanner does not alignwith the bow-stern axis.Measuring the Potential Front-of-Boat OffsetThe front-of-boat offset compensates for the physical location ofthe radar scanner on a boat, if the radar scanner does not alignwith the bow-stern axis.1 Using a magnetic compass, take an optical bearing of astationary target located within viewable range.2 Measure the target bearing on the radar.3 If the bearing deviation is more than +/- 1°, set the front-of-boat offset.Setting the Front-of-Boat OffsetBefore you can set the front-of-boat offset, you must measurethe potential front-of-boat offset.The front-of-boat offset setting configured for use in one radarmode is applied to every other radar mode and to the Radaroverlay.1 From a Radar screen or the Radar overlay, select Menu >Radar Setup > Front of Boat.2 Select Up or Down to adjust the offset.24 Radar