88 AQUAMAP™ 10x2/12x2 SERIESmust have this setting turned on.Units SettingsSelect Settings > Preferences > Units.System Units: Sets the unit format for the device.North Reference: Sets the direction references used in calculating headinginformation. True sets geographic north as the north reference. Grid setsgrid north as the north reference (000º). Magnetic sets the magnetic northas the north reference.Variance: Sets the magnetic declination, the angle between magnetic northand true north, for your present location.Position Format: Sets the position format in which a given location readingappears. Do not change this setting unless you are using a map or chartthat specifies a different position format.Map Datum: Sets the coordinate system on which the map is structured. Donot change this setting unless you are using a map or chart that specifiesa different map datum.Time: Sets the time format, time zone, and daylight saving time.Navigation SettingsNOTE: Some settings and options require additional charts or hardware.Select Settings > Preferences > Navigation.Route Labels: Sets the type of labels shown with route turns on the map.Turn Transition: Adjusts how the AQUAMAP transitions to the next turn orleg or the route. You can set the transition to be based on time or distancebefore the turn. You can increase the time or distance value to helpimprove the accuracy of the autopilot when navigating a route or an AutoGuidance line with many frequent turns or at higher speeds. For straighterroutes or slower speeds, lowering this value can improve autopilotaccuracy.Speed Sources: Sets the source for the speed readings.Auto Guidance: Sets the measurements for the Preferred Depth, VerticalClearance, and Shoreline Distance, when you are using some premiummaps.Route Start: Selects a starting point for route navigation.Auto Guidance Path ConfigurationsCAUTIONThe Preferred Depth and Vertical Clearance settings influence how theAQUAMAP calculates an Auto Guidance path. If an area has an unknownwater depth or an unknown obstacle height, the Auto Guidance path is notcalculated in that area. If an area at the beginning or the end of an AutoGuidance path is shallower than the Preferred Depth or lower than theVertical Clearance settings, the Auto Guidance path may not be calculated inthat area, depending on the map data. On the chart, the course through thoseareas appears as a gray line or a magenta and gray striped line. When yourboat enters one of those areas, a warning message appears.NOTE: Auto Guidance is available with premium charts, in some areas.NOTE: Not all settings apply to all maps.You can set the parameters the AQUAMAP uses when calculating an AutoGuidance path.Preferred Depth: Sets the minimum water depth, based on chart depth data,that your boat can safely travel over.NOTE: The minimum water depth for the premium charts (made before2016) is 3 feet. If you enter a value of less than 3 feet, the charts only usedepths of 3 feet for Auto Guidance path calculations.Vertical Clearance: Sets the minimum height of a bridge or obstacle, basedon chart data, that your boat can safely travel under.Shoreline Distance: Sets how close to the shore you want the AutoGuidance path to be placed. The Auto Guidance path may move if you