Calibrate speed – Lowrance electronic LMS 335C DF User Manual

Page 71

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63

Sonar Alarms menu with Fish Alarm selected. The check box to the left

is blank, indicating the alarm is turned off.

To turn the fish alarm on:

1. Press

MENU

|

MENU

|

↓ to

A

LARMS

|

ENT

|

↓ to

S

ONAR

A

LARMS

|

ENT

.

2. Press

↓ to

F

ISH

A

LARM

|

ENT

|

EXIT

|

EXIT

|

EXIT

.

3. To turn off the alarm, press

MENU

|

MENU

|

↓ to

A

LARMS

|

ENT

|

↓ to

S

ONAR

A

LARMS

|

ENT

|

↓ to

F

ISH

A

LARM

|

ENT

|

EXIT

|

EXIT

|

EXIT

.

Calibrate Speed

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.

A good way to gauge your speed sensor's performance is to compare its
reading with the ground speed measured by your unit's GPS functions.
When you make a run to compare GPS ground speed to speed sensor
speed, perform your test in relatively calm water free of current, if pos-
sible. (Unless, of course, you are taking the current speed into consid-
eration when making your calculation.) After you have a correction fig-
ure, here's how to enter it:

1. Press

MENU

|

MENU

|

↓ to

S

ONAR

S

ETUP

|

ENT

|

↓ to

C

ALIBRATE

W

ATER

S

PEED

|

ENT

.

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

EXIT

.

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