Lowrance x510c ユーザーズマニュアル

53 

 

1. Press the 

key on the front of the unit or press

|

 and 

use 

↑ or ↓ to select Sonar Alarms, then press 

. 

2. Press 

↓ to 

|

|

. 

3. To turn off the alarm, Press the 

key on the front of the unit or 

press

|

 and use 

↑ or ↓  to select Sonar Alarms, then  press 

. Press 

↓ to  

|

|

. 

See the entry in this section for Screen Contrast and Brightness. 

The speed sensor can be calibrated to compensate for inaccuracies. Be-

fore you change the setting, first calculate the percentage that the 

speed is off. You will enter this percentage in a moment. 
For example, if you figure the sensor is reading 10 percent faster than 

actual speed, you will enter – 10 in the calibration window. If the sen-

sor is reading 5 percent slower than true speed, you will enter + 5 in 

the window. 
Perform your test in relatively calm water free of current, if possible. 

(Unless, of course, you are taking the current speed into consideration 

when making your calculation.) After you have a correction figure, 

here's how to enter it: 
1. Press 

|

|

↓ to 

|

. 

2. Enter the number you calculated earlier: press 

↑ or ↓ to change the 

first character (+ or –), then press 

→ to move the cursor to the next 

number and repeat until the percentage is correct, then press 

.