Titan TTS2 Manual page 65

3) Press [F1](Input) to input point "1"(Here, you can retrieve
points) and press [F4];
[Enter]→
4) If the point doesn't exist in this file, tips "None Pt.n". You
can press [F3](Coord.) to input coordinates, then press [F4]
to confirm;
5) Press [F4](Yes) to enter the interface of "Input T.H". After
input the target height (T.H) , press [F4];
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[Enter]→