User manual GARMIN 900 GPS

[. . . ] History of Revisions October 1993 October 1993 December 1993 June 1994 December 1994 Original Release Revision 01 Revision 02 Revision 03 Revision 04 Ordering Information This manual covers software version 3. 0 or greater. To receive additional copies of this publication, order part #560-0101-04, Apollo Handheld GPS Receiver User's Guide. II Morrow is a trademark of II Morrow Inc. The Apollo logo is a registered trademark of II Morrow Inc. [. . . ] The left or right offset distance you select represents CDI mid-scale when "Parallel Track On" is set to "Yes. " D 13 Magnetic Variation This option allows you to override automatic magnetic variation and manually enter a variation value. This is normally not required for navigation anywhere in the world except near the poles, where magnetic variation is the greatest. D 14 If manual entry of magnetic variation is necessary, obtain the correct value from a reliable chart or other source. Select "Manual" and enter the variation value east or west. To disable magnetic variation, select "True. " All course headings will show referenced to true north. Countdown Time The Apollo handheld GPS receiver includes a countdown timer. Use this option to enter a time of up to 60 minutes. After starting the timer, the receiver will sound the beeper and show a message on the display when the entered time has elapsed. D 15 Display Units This option allows you to change the way navigation units of measure show on the display. You can select the units shown for each navigation parameter: n n n distance: nm/kts; sm/mph; km/kph altitude: feet; meters LAT/LON: d-m. mmm; d-m-S. (where d=degrees, m=minutes, and s=seconds of latitude or longitude) Serial Outputs The Apollo handheld GPS receiver is equipped with a serial data port for communication with external serial devices. This option controls the outbound data function of the port. Using this option with an appropriate cable connection, you can: n n D 16 n send serial data to an external moving map display send serial data matching the NMEA formats to any serial device capable of accepting it disable the serial data port Before attempting to send serial data to an external device, use the optional serial data cable to connect the receiver to the desired device. The cable is equipped with a standard DB9 connector to fit most device serial ports. If the device has a serial port with a different connector, you need to purchase the correct connector and attach it to the cable. See "Making External Connections" at the back of this section for information on properly connecting the serial cable. Use this option to select: n n D 17 n n "None" - disable the serial port "NMEA 0183 v1. 50" - output NMEA sentences GPBWC, GPGLL, GPRMB, GPRMC, GPR00, GPWPL, GPXTE "NMEA 0183 v2. 00" - output NMEA sentences GPBWC, GPGLL, GPRMB, GPRMC, GPRTE, GPWPL, GPXTE "Moving Map" - output moving map data using Apollo NMC2001 format Battery Check This option provides a graphic indication of battery condition on a scale from "Low" to "Full. " The combined voltage of the six AA batteries is indicated at the bottom center of the screen. Also, a small battery symbol is shown at the top of the main menu indicating the battery capacity. For satisfactory receiver operation, battery voltage should be between 6 and 9 volts. You will receive a warning message on the display if battery voltage falls below 6 volts. After the warning message shows on the display, the receiver will continue to operate for 20 to 30 minutes. Switch the display backlight off to conserve power. Replace the batteries promptly to avoid loss of time, user waypoints, routes, and system setup information stored in memory. Do not allow low or discharged batteries to remain installed in the receiver as leakage could damage internal components. D 18 User Waypoint Management This option allows you to manage the database of user waypoints. You can edit or delete waypoints as your area of travel or other requirements change. It is important to manage user waypoints wisely. With the capacity to store up to 2, 000 user waypoints in memory, the Apollo handheld GPS receiver can retain an immense amount of information. When you edit, use intuitive identifiers for waypoints you have created. [. . . ] Mag Var (Magnetic Variation): The angle between the magnetic and true north. It differs at various points on the earth due to local magnetic disturbances. It is shown on charts as isogonic lines marked with degrees of variation, either east or west, degrees which must be added to or subtracted from the true course to get the magnetic course. Easterly variations are deducted, and westerly variations are added. [. . . ]