Humminbird Ultima manual

2.Setting Depth Range; Factory setting: On (Automatic)

When you turn the Ultima on, it finds the bottom, sets the ideal depth range, and automatically adjusts the depth range (to as much as 185 meters) as the depth changes. In this "Auto Depth Range" mode, the bottom is blacked-in for easy-to- understand readings.

If you prefer, you can turn Auto Depth Range off. Select DEPM RANGE, press ON-OFF, and adjust the Depth Range with the UP or DOWN arrow key.

In this "Manual Depth Range" mode, the bottom is not blacked in.This lets you see a "second return," which is preferred by some fishermen because the width of the second echo can indicate bottom hardness.

3.Enabling Bottom Alarm; Factory setting: OFF

The Bottom Alarm lets you specify the minimum depth you want to maintain. To use it, select Bottom Alarm; then, press the ON-OFF button to activate the alarm, and the UP or DOWN arrow key to adjust the depth at which the alarm will sound. An alarm symbol is displayed when this function is on.

When Bottom Alarm is on, you'll hear a continuous chirping sound when the bottom is shallower than you defined. This is very handy for alerting you to shallow water or helping you to maintain position over structure.

NOTE: The Ultima should not be used as a navigation aid to prevent collision, grounding, boat damage or personal injury.