Garmin Gps Plus 2 Manual

75
Screen Contrast
The GPS II
+has adjustable screen contrast controlled by an on-screen bar scale.
To set the screen contrast:
1. Highlight the ÔcontrastÕ field, and press ENTER.
2. Adjust the bar scale to the desired contrast, and press ENTER.
Note: The screen contrast can also be adjusted by pressing the rocker keypad
while on the Satellite Page (see p. 20).
Screen Backlighting
The screen backlight timer is adjustable for 0, 15, 30, 60, 120, and 240 seconds.
The Ô0Õ setting will keep backlighting on...

76
Navigation Setup
The navigation setup submenu page (Fig. 76a) is used to select units of measure-
ment for position formats, map datums, CDI scale, units, and heading information.
Position Formats
The default position format for the GPS II
+is latitude and longitude in degrees
and minutes (hddd¼mm.mmmÕ). You may also select degrees, minutes and seconds
(hddd¼mmÕss.sÕÕ); degrees only (hddd.ddddd¼); UTM/UPS coordinates; or British,
German, Irish, Maidenhead, Swedish, Swiss, or Taiwan, or User grid...

77
Map Datums
The ÔdatumÕ field is located just below the ÔpositionÕ field and comes with a WGS
84 default setting. Although 106 total map datums are available for use (see
Appendix E for map datums), you should only change the datum if you are using
maps or charts that specify a different datum than WGS 84.
To select a map datum:
1. Highlight the ÔdatumÕ field, and press ENTER.
2. Select the desired setting, and press ENTER.
To define a user datum:
1. Highlight the ÔdatumÕ field, and press ENTER.
2....

78
CDI Scale Settings
The course deviation indicator (CDI) definition field lets you select the +/- range
of the CDI bar scale on the Highway Page. Three scales are available: +/- 0.25
(default), 1.25, and 5.0 miles or kilometers. Note: This CDI value represents the full
deflection of scale to either side.
To enter a CDI scale setting:
1. Highlight the Ôcdi scaleÕ field (Fig. 78a), and press ENTER.
2. Select the desired setting, and press ENTER.
Units of Measure
The GPS II
+lets you select statute...

79
Magnetic Heading Reference
The GPS II
+Õs heading information can be displayed referencing magnetic north
(automatic or user-defined), true north, or calculated grid headings. The default set-
ting is automatic magnetic north, which is suitable for most applications.
To select a heading reference:
1. Highlight the ÔheadingÕ field (Fig. 79a), and press ENTER.
2. Select the desired heading preference, and press ENTER.
To enter a user-defined magnetic heading:
. 1. Select ÔUser MagÕ and press ENTER (Fig....

80
Interface Setup
The GPS II
+Õs interface page lets you specify the formats for connecting external
devices. There are six options: GRMN/GRMN, None/None, RTCM/None,
RTCM/NMEA, NMEA/NMEA, and None/NMEA. Each option lists the input format
first, followed by the output format.
To select I/O format:
1. Highlight the I/O field, and press ENTER.
2. Select the desired setting, and press ENTER.
The GRMN/GRMN setting is a proprietary format that lets you exchange infor-
mation such as waypoints, routes, and...

Reference
81
DGPS Interface
The last two format settings allow the differential-ready GPS II
+to accept RTCM
DGPS corrections in RTCM 104 version 2.0 format. Using DGPS corrections will
improve receiver accuracy to 1-5 meters, regardless of errors induced by the govern-
mentÕs Selective Availability (SA) program. Two RTCM options are available:
RTCM/NONE (81a), which allows connection to a beacon receiver with no output
capability; and RTCM/NMEA (81b), which allows DGPS input and NMEA output.
Once a RTCM...

82
When the GPS II+is receiving DGPS corrections from the GBR 21, the Ôbeacon receiverÕ sec-
tion of the I/O setup page will display the beacon frequency and signal strength, as well as the
distance from the transmitter to the beacon receiver. At the bottom of the beacon receiver field,
a status message will keep you informed of DGPS activity:
¥ A ÔtuningÕ message will be displayed while a beacon signal is being tuned.
¥ Once the beacon signal has been tuned, a ÔreceivingÕ message will be displayed.
¥ If...

Reference
83
Fig. 83a
Fig 83b
Navigation Simulator
The GPS II
+Õs simulator mode lets you practice all aspects of its operation without
active satellite acquisition. You can plan and practice trips, enter new waypoints and
routes, and save them for use during normal operation.
To activate the simulator:
1. From the Menu Page, highlight ÔSYSTEM SETUPÕ (Fig. 83a), and press ENTER.
2. Highlight the ÔmodeÕ field, and press ENTER.
3. Select ÔSimulator?Õ (Fig. 83b), and press ENTER.
Once the simulator mode has...

84
Dashboard Mounting
The GPS II
+can be mounted on the dashboard of an automobile or to another convenient surface using the
two Velcroªstrips provided with the unit. 
To mount the GPS II
+using the Velcro strips:
1. Select a location for the unit that provides a clear and unob-
structed view of the sky.
2. Remove the paper strip liners from both pieces of Velcro.
3. Make sure the surface to which youÕre adhering the Velcro is
clean and dry. Place the adhesive side of the rough piece of
Velcro on the...