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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.
USING THE 250DX
MENU FUNCTIONS