Lowrance electronic X515C DF Benutzerhandbuch

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lower engine unit can be several feet. In those cases, an inexact depth 

reading could result in grounding or striking underwater structure. 

The Keel Offset feature eliminates the need for the navigator to men-

tally calculate how much water is under his keel. 
Keel Offset lets you calibrate the digital depth: chart depth scale, chart 

cursor depth and fish symbol depth displayed on the screen. To calibrate 

the depth indicators, first measure the distance from the face of the trans-

ducer to the lowest part of the boat. In this example, we will use 3.5 feet. 
We enter this as a negative 3.5 feet, which makes the depth indicators per-

form as if the transducer's lower in the water than it really is. 

1. Press 

|

|

↓ to 

|

. 

2. The Keel Offset dialog box appears. Press 

↓ to change the plus (+) 

sign to a minus (–) sign. 
3. Press 

→ to the first number, then press ↑ to change the number to 3 

4. Press 

→ to the second number, then press ↑ to change the number to  

5, then press 

. The depth indicators now accurately show the depth 

of water beneath the keel. 
NOTE: 

If knowing the exact depth of water beneath the keel is less impor-

tant, you can calibrate the depth indicators so that they show the ac-

tual water depth from surface to bottom. To do this, first measure the 

distance from the face of the transducer up to the surface (the water 

line on the boat). In this example, we will use 1.5 feet. This will be en-
tered as a positive 1.5 feet, which makes the depth indicators perform 

as if the transducer's higher in the water than it really is. 
1. Press 

|

|

↓ to 

|

. 

2. The Keel Offset dialog box appears with a plus (+) sign at the 

front of the box. 

3. Press 

→ to the first number, then ↑ to change the number to 1. 

4. Press 

→ to the second number, then ↑ to change the number to 5. 

Press 

to return to the previous page. The depth indicators now 

accurately show the water depth from surface to bottom. 

This unit's menus are available in 10 languages: English, French, Ger-

man, Spanish, Italian, Danish, Swedish, Russian, Dutch and Finnish.