RISCO Group Gardtec GT600 - Manual (Page 7)

Note: At any point when three underscores are shown on the display, you are
viewing a Header. You may move to the next Header by Pressing the NO
Key or access the functions under the Header by Pressing the YES Key.
Note: You are able to jump to various common options when programming by
entering the relevant menu numbers. With a Header showing, key in the
appropriate menu number, then press Yes. (See page 9).
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GT 600 / 601 Engineer’s Reference Guide