Lowrance Link-6S User Manual page 19

A true north heading is corrected for magnetic declination. A
magnetic north heading source must also output magnetic
variation data if the heading is to be displayed as a true north value.
Int speaker
Select to switch the radio's internal speaker ON or OFF.
Ext speaker
Select to switch the radio's external speaker ON or OFF.
GPS
MANUAL
Select MANUAL to enter a GPS position (and time) from another
source when radio is not receiving position data from an external
antenna, or no antenna is connected.
The manually entered GPS position can be used in DSC calls.
If POS Display is turned ON, the latitude and longitude are shown on
the screen with a prefix 'M' indicating manual entry.
¼ Note:
The manual entry is cleared if a real GPS position is received
via the NMEA 0183 or Internal GPS, depending on the GPS SOURCE
setting.
GPS SOURCE
•
Choose NMEA 0183 to have the radio listen for GPS data on its serial
NMEA 0183 port
•
Choose BUILT-IN to use the internal GPS system. You then have a
choice of using the INTERNAL GPS antenna built into the radio, or
an optional EXTERNAL GPS antenna connected to the radio external
GPS antenna SMA port.
CHECKSUM
Select to toggle ON or OFF. When ON, NMEA 0183 data received is
validated. If the checksum does not match, the data will be ignored.
When OFF, there will be no tolerance to data corruption.
The radio menus | Link-6S User Guide
| 19