Eagle Electronics CUDA 350 S/MAP User Manual

Page 83

If the transducer is 1 foot below the surface and the screen shows the

water depth as 30 feet, then the actual depth is 31 feet.
On sailboats or other large vessels with deep drafts, the distance be-

tween the transducer installation and the keel or 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 mentally calculate how much

water is under his keel.
Keel Offset lets you calibrate the digital depth indicators: chart depth

scale, chart cursor depth and fish symbol depth displayed on the screen.

To calibrate the depth indicators, measure the distance from the face of

the transducer 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 indi-

cators perform as if the transducer is lower in the water than it really is.

1. Press

MENU

↓ to

ONAR

ETUP

ENT

2. Select

EEL

FFSET

and press

ENT

3. The Keel Offset dialog box appears. Press

↓ so the displayed number

shows a minus (–) sign instead of the plus (+) sign.
3. To change the next digit, press

→ then use ↑ ↓ to enter 3. Move to

the next digit and enter 5, then press

EXIT

. The depth indicators now

accurately show the depth of water beneath the keel as -3.5.
NOTE:

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

tant, you can calibrate the depth indicators so they show actual water

depth from surface to bottom. To do this, measure the distance from

the face of the transducer to the surface (the water line on the boat).
In this example, we will use 1.5 feet. This will be entered as a positive

1.5 feet, which makes the depth indicators perform as if the trans-

ducer is higher in the water than it really is.