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Topcon Positioning Support Hub  is a dedicated place for Land Surveyors United  members who use Topcon Instruments in the field to share experiences and support one another with troubleshooting issues. This group is specifically for discussions and tutorials related to Topcon Land Surveying Equipment.

Please Note: Land Surveyors United Community  is not directly affiliated with Topcon and all logos and imagery are copyright of respective owners.  This group is for educational purposes and social support with Topcon Equipment.

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Land Surveyor


I am looking to replace my DL 101 with a DL 501. The dealer, who does not stock these and seems to know little about them, is telling me that the 501 will not read the old rods and that I need to buy new and very expensive ones.Would Topcon do this to us? Actually, I believe that they would. Has anyone had any experience with these? Has anyone successfully used a Trimble level to read Topcon rods?Thanks

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Land Surveyor

tpsOops.dll module can't be loaded

Hi everyone. My MS1Ax total station has got a problem when loading on board TopSurv. When I start the program, I get this error message  If I go on, I can still use some functions, but for instance, if I try to make a resection using three points that I have previously recorded, I can’t see the list of the recorded points. In several instances, this error message gets back again.I have also tried to replace the tpsOpts.dll file with the one that I have in another total station (whic works…

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Combining scans from a Topcon IS 303

Good evening everyone,I'm a geophysicist who needs to carry out topographic surveys from time to time. I have a Topcon Imaging Total Station - an IS303 - and with I have carried out successful surveys and scans - but only ever from a single known location.Now I have a serious and urgent problem and I would be grateful if anyone can help me.I carried out a survey of a mosaic which forms part of the floor of a cathedral. The mosaic is within a complicated room with immobile structures in the…

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Survey Legend

Topcon Offers Library of eLearning Courses 100% Free

If you want to advance your knowledge or are interested getting deeper in to new topics you have been aware of from a distance, Topcon’s e-learning platform has been made free of charge while we all face challenging times.  Make use of the extra flexibility in your work schedule to check out educational opportunities from myTopcon eLearning without the need for travel. For a limited time all of Topcon’s eLearning courses are being offered free of charge. Just use the coupon code: CABINFEVER at…

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1 Reply · Reply by J Keith Maxwell Apr 2, 2020

Lcd for topcon

Good day again to all,Are lcd can be repaired? I have a second thought of buying used instrument. I plan to buy a used topcon instrument model cs-20r but lcd is not clear. Can it be repaired? Thank you all. 

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1 Reply · Reply by mohan.sirc Jun 3, 2021

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  • Land Surveyor
    Welldone everyone, I'm working on a site. Please how can I carry out insitu check using three pillars with topcon total station GTS 105N?
  • GPT3005 sorry

  • I am using a GRT3005 regarding below desperate plea.

  • Hi all,

    I have a serious problem. Shooting forsights and baksights for my fellow theodlight user on gridlines, I set a nail on that same gridline. When I attempted to interline on that nail, I discovered my foresight and backsite were way off. I was resecting all over the site shooting gridlines using verified verified 5 different backsite. All residuals were within 3 mm. How is this possible? Previously my points, prism and prismless were within two mm of two different top end Leica's, two different professional surveyors. It's a new top me total station running an old version of SurveyPro. Please please help me solve this.

  • *thumbs up*

  • i use only  topcon instruments  such as total station, auto level.

    Easy station,GTS 105,102,235 and e.t.c.AGT G3,G4.


  • I use Topcon Green Lable GTS 105N with Topcon link,

    Ineed a software which enables direct contouring from raw data

  • Land Surveyor
    Slant Height: yellow arrow
  • hi...i'm using the GPT3005w and GTS-226 total station. just want to ask, what normally caused the H-angle error? both of my total station display the same error on the screen. thanks...
  • GEO Ambassador
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