40 TRACKER 5100/5100i/5500/5500i Installation and Operation ManualNAVMANNavigation dataThe boat is sailing from the start to the destination and has moved off the plotted course from the start to thedestination.BRG Bearing to Destination Bearing to the destination from the boat.+BRG Bearing to cursor Bearing to cursor from boat (cursor mode, see section 3-1-1).CDI Course Deviation Indicator When the boat is navigating to a point, the chart and highway displaysshow a parallel line on either side of the plotted course. These twolines are called the Course Deviation Indicator (CDI) lines. The distancefrom the plotted course to a CDI line is the CDI scale.Set the CDI scale (see section 13-2) to the maximum distance that theboat should deviate from the plotted course. The chart and highwaydisplays show the CDI lines, which are like a highway over the waterwhere the boat will move. The displays show how far the boat hasdeviated from the plotted course and if the boat is approaching a CDIline. If the XTE alarm is enabled (see section 13-6) an alarm will soundif the boat reaches a CDI line.COG Course Over Ground Direction in which the boat is moving over the ground.CTS Course To Steer Optimum course to steer to return to the plotted course.DTG Distance To Go Distance from the boat to the destination.ETA Expected Time of Arrival At the destination, assuming that SOG and COG remain constant.+RNG Range to cursor Distance from boat to cursor (cursor mode, see section 3-1-1).SOG Speed Over Ground Current boat speed over the ground. This is not necessarily the sameas the boat speed through the water nor the speed at which it isapproaching the destination.STR Steering The difference between COG and CTS.TTG Time To Go The estimated time to reach the destination.XTE Cross Track Error The distance from the boat to the nearest point of the plotted course.XTE may have a letter: R means steer to the right to return to the plottedcourse, L means steer to the left.VMG Velocity Made Good The speed at which the boat is approaching the destination.CTSSOG (speed) VMG (speed)BRGCOGDestinationBoat positionStartSTRDTG (distance)CDI scale(distance)PlottedcourseStartDestinationXTE(distance)BoatpositionCDI scale(distance)CDI linePlottedcourseCDI line