Furuno FEA-2107 Operator's Manual page 580

Appendix 4: C-MAP CM-93/3 Charts
Browsing your charts
You may view S57 charts using different positions and different scales. The basic tools for browsing charts are
Range -, Range+, Set Chart Center, ShipOffcenter and TM Reset.
Set Chart Center allows you to look ahead from a place other than own ship's current position. Choose Set Chart
Center from the Main menu to display the dialog box shown below. Use the scrollwheel to set the latitude and
longitude position for chart center and then click the Set Center button.
Note: The chart can also be centered (with less precise positioning) by placing the cursor at desired location,
displaying Set Chart Center/Info/Activate Scroll in the dialog box and pushing the left button.
To turn off automatic true motion reset, display and click TM Reset (in the guidance area). When true motion
reset is off, the indication "Ship off screen" appears in the information area.
To restore own ship's position to the screen center, display TM Reset/Info/ShipOffcenter in the guidance area
and then push the right button.
Range - and Range+ change the chart scale. If true motion reset is active, ZOOM IN and ZOOM OUT keep the
relative position of the own ship with respect to the display. If true motion reset is on, ZOOM IN and ZOOM OUT
keep the relative position pointed by the cursor with respect to the display.
The system automatically chooses next larger or smaller scale. If a chart with larger compilation scale is available at
your current viewing position, the message "Larger Scale Data Exists" appears.
Looking for charts around own ship
You can use either true motion or relative motion. In the true motion mode, own ship moves until it reaches the true
motion reset borderline, where it jumps back to an opposite position on the screen based on ship's course. In the
relative motion mode, own ship stays in a fixed position, while the chart moves on screen.
If, in the true motion mode, you reset own position with TM Reset, own ship will immediately jump to the true
motion reset position.
If, in the true motion mode, you use ShipOffcenter, your ship will go to that position on screen and continue true
motion movement from that position. When it reaches the true motion reset borderline, it will automatically jump to
the true motion reset position.
If, in the relative motion mode, you reset own position with TM Reset, your ship will immediately jump to the true
motion reset position and use that position as fixed position to stay on screen.
If you use relative motion, you can choose a new fixed position for your ship by using ShipOffcenter.
Use Range - and Range+ to choose desired chart scale.
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