Lowrance 7200c 操作指南

84 

Trackline Extension window are two check boxes (Show Time and Show Dis-

tance) which allow you to turn on or off the time and/or distance settings.  
To set trackline extension: From the Map Page, press 

|

↓

 to 

|

. Press 

↓

 to 

|

Use 

↑ ↓ to select the desired 

distance setting and press 

Presentation Mode 
From the Map Page, press 

|

↓

 to 

|

. Press 

↓

 and 

→ to 

|

Use 

↑ ↓ to choose the desired depth and press 

. 

Presentation Mode gives you some control over the map layout by allow-

ing you to choose between US and International Modes. 
Safety Contour 
From the Map Page, press 

|

↓

 to 

|

. Press 

↓

 and 

→ to 

|

Use 

↑ ↓ to choose the desired depth and press 

. The 

 command allows you to modify depth contours on a navionics 

map for water less than 10 meters deep. Based on your preferences, the 

depth contours will be colored or shaded to make it easier to identify shallow 

areas. Keep in mind the size of your ship's keel when determining which 

option is right for your vessel. 
Map Overlays (Range Rings; Lat/Long Grid) 

The map screen can be customized with four range rings and/or grids that 

divide the plotter into equal segments of latitude and longitude. 
Range rings are handy for visually estimating distances on the map. The ring 

diameters are based on the current zoom range. For example: at the 100-mile 

zoom, the screen will show two rings with your current position in the center. 

The large ring touching the left and right sides of the screen is 100 miles in 

diameter (same as the zoom range). The second smaller ring is 50 miles in di-

ameter (always 1/2 the zoom range). 
The distance from your current position to the smaller ring (the ring's ra-

dius) is 25 miles (always 1/4 the zoom range). With the arrow keys and map 

cursor, you can scroll the map to see the third and fourth rings. In this ex-

ample, the distance to the third ring is 75 miles and distance to the fourth 

ring is 100 miles from your current position. 
To set range rings: From the Map Page, press 

|

↓

 to 

|

. 

Press 

↓

to 

. With the option highlighted, press 

 to check it (turn 

on) and uncheck it (turn off). After the option is set, press 

|

 to return 

to the page display. 
To set Lat/Long Grid: From the Map Page, press 

|

↓

 to 

|

. Press 

↓

to 

. With the option highlighted, 

press 

 to check it (turn on) and uncheck it (turn off). After the op-

tion is set, press 

|

 to return to the page display.