Topcon Marine Instruments GPT-2000 Manuel D’Utilisation

4-7

   4 DISTANCE MEASUREMENT

This mode is useful when it is difficult to set up the prism directly, for example at the center of a tree. 
Place the prism at the same horizontal distance from the instrument as that of point A0 to measure.
To measure the coordinates of the center position, operate the offset measurement after setting the 
instrument height/prism height.

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Set the instrument height/prism height before proceeding to the offset measurement mode.

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When setting the coordinate value for the occupied station, refer to Section 5.1 “Setting Coordinate 
Values of Occupied Point”.

Press the [F4](P1

↓

) key from distance measuring 

mode to get the function on page 2.

[F4]

Press the [F1](OFSET)  key.

[F1]

Press the [F1](ANG. OFFSET)  key.

[F1]

Collimate prism P, and press the [F1](MEAS) key.

Collimate P

[F1]

Prism P

  

Prism height

Instrument height

Occ. Point

When measuring coordinates of ground point A

1

:Set the instrument height/prism height.

When measuring  coordinates  of point A

0

 : Set 

the instrument height only. (Set the prism height 
to 0 ).

When sighting to A

0

, you can select one of two 

ways. One is to fix vertical angle to the prism 
position even updown the telescope position, and 
the other is to gear vertical angle to the updown of 
telescope movement. In case following the 
vertical angle to the movement of telescope, 
SD(Slope Distance) and VD(Vertical Distance) 
will be changed according to the movement of 
telescope.
To set this option, refer to Chapter 16 
“SELECTING MODE”.

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