Lowrance 3500c 操作ガイド

80 

Map Datum Selection 

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. 

 

Map Datum Menu. 

Map Detail Category Selection 

This menu determines which of the mapping features are shown on the 
screen. This includes, waypoints, trails, icons, cities, highways, etc. You 
can selectively turn on or off any of these items, customizing the map to 
your needs. 

To get to Map Categories: 

1. From the Map Page, press 

|

↓ to 

|

. 

2. Press 

↑

 or 

↓

 to select a category or press 

→

 then press 

↑

 or 

↓

 to select 

a subcategory. Press 

 to turn it off (no check) or on (checked.) 

3. To return to the last page displayed, press 

|

.