Furuno RP-250 - Manual (Page 30)

4. WAYPOINTS, NAV LINES
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4.5.8 Displaying navigation lines
Set nav line as show in previous paragraph and then follow the procedure
below to display nav line.
1. Press the [NAV MENU] and [3] keys.
2. Press the [3] key to choose NAV LINE NO.
3. Key in nav line no. with the numeric keys and then press the [ENTER] key.
You may enter five nav line numbers. Note that the same nav line no.
cannot be entered more than once.
4. Press the [NAV MENU] key to close the menu.
Note: To remove a nav line from the display, set NAV LINE to OFF.