GPSMAP® 4000/5000 Series Owner’s Manual 2confIGurInG the unItconfIGurInGthe unItSetting System alarmsTo set a system alarm, from the Home screen, select Configure > Alarms > System.Clock—set an alarm using the system (GPS) clock. The unit must be on for the clock alarm to work.Battery—set an alarm to sound when the battery reaches a user-determined low voltage.GPS Accuracy—set an alarm to sound when the GPS location accuracy falls outside the user-determined value.Setting Sonar alarmsTo set a sonar alarm, from the Home screen, select Configure > Alarms > Sonar.NOtE: You must have an optional sonar module (and a transducer connected to the soundermodule) wired through NMEA 0183 or connected to the Garmin Marine Network to receive sonarinformation.Shallow Water/Deep Water—set an alarm to sound when the depth is less than or greater than thespecified value.Water Temp—set an alarm to sound when the transducer reports a temperature that is 2° F (1.1° C)above or below the specified temperature.Fish—set an alarm to sound when the unit detects a suspended target of the specified symbols.Configuring My BoatTo configure settings for your boat, from the Home screen, select Configure > My Boat.Auto Guidance—set the Auto Guidance parameters for your boat:Safe Depth—set the minimum depth (refers to the chart depth datum) to allow whencalculating an auto guidance path.Safe Height—set the minimum height (refers to the chart height datum) of a bridge that yourboat can safely travel under.Keel Offset—offset the surface reading for the depth of a keel. This makes it possible to measuredepth from the bottom of your keel instead of from the transducer’s location. Enter a positivenumber to offset for a keel. You can enter a negative number to compensate for a large vessel thatmay draw several feet of water.To adjust the Keel Offset:1. From the Home screen, select Configure > My Boat > Keel Offset.2. Use the select screen keyboard to specify the offset.3. Select Done to accept the number.NOtE: Select Cancel to cancel your changes and return to the My Boat screen.Transducer—select the transducer type, set the temperature source, sonar cone angles, and calibratewater speed.Temperature Source—set the temperature source (Transducer or NMEA).•••