Lowrance 5200c 操作ガイド

 

82 

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 diameter (always 1/2 the zoom range). The distance from your 

current position to the smaller ring (the ring's radius) is 25 miles (al-

ways 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 example, 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 

|

→ to 

. With the op-

tion 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 

|

→ 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. 

Maps and charts are based on a survey of the area that's covered by the 

map or chart. These surveys are called "Datums." Maps that are cre-

ated using different datums will show the same latitude/longitude in 

slightly different locations.  
All datums are named. The GPS system is based on the WGS-84 da-

tum, which covers the entire world. Other datums may also cover the 

entire world or just a small portion of it. By default, your position 

shows using the WGS-84 datum. However, it can show your position 

using one of 191 different datums. Different datums can be selected; to 

change the datum: 
1. Press 

|

|

↓ to 

|

|

↓ to 

|

. 

2. Scroll 

↓ or ↑ to select the desired datum, then press 

. 

3. To return to the last page displayed, press 

|

. A list of the 

datums used by this unit is in the back of this manual.