Using the 250DX

MENU FUNCTIONS

Depth Range. The Depth Range function controls the vertical distance displayed on the graphic area of the display. There are

nine depth ranges available. The top of the

range is always 0, or the surface of the water. Ranges of 0–15', 0–30', 0–60', 0–120', 0–180', 0–240', 0–360', 0–480',

and 0–600' are available. In the metric version, ranges of 0–5, 0–10, 0–20, 0–40, 0–60, 0–80, 0–110, 0–150, and 0–185 metres are available.The range that positions the bottom depiction closest to the bottom of the screen, will best utilize the available display resolution.

The 250DX automatically adjusts the depth range depending on the depth of the water. The unit tries to maintain the bottom depiction about ²⁄₃ down the total range (for example, in 20' (6m) of water, the 0-30' (0-10m) range would be selected). This provides the best display resolution and therefore the best target separation possible.

The Depth Range can be adjusted manually. Press MENU repeatedly until the Depth Range menu is visible. Two options are available: Auto and Manual.

The manual setting enables you to adjust

the current depth range setting. The unit no longer adjusts the Depth Range to the most appropriate range for bottom

display. Often, the bottom may not be visible on-screen. The digital depth readout always determines the depth of the bottom, even if it is not visible on-screen.

Using manual Depth Range control, you can view sonar information from the area near the surface in great detail.