Topcon GT Series Robotic Total Stations
The flagship Topcon GT series delivers speed, power, and flexibility for the most demanding survey and construction workflows. Available in six models across two sub-families, the GT series gives you the right combination of accuracy, range, and motor speed for any application.
Two Platforms, Six Models
The GT-1500 series is built for professionals who need the fastest motors, longest range, and highest distance accuracy. The GT-700 series delivers the same core platform at a value that makes robotic layout accessible to more crews and more projects.
GT-1500 Series
Survey-grade flagship platform
The GT-1500 is the top of the Topcon robotic line. With 200-degree-per-second Brushless Direct Current motors, 5,000-meter prism range, 1,000-meter reflectorless capability, and 1 mm fine distance accuracy, the GT-1500 handles everything from high-order control networks to construction monitoring.
| Motor Speed | 200°/sec (BLDC) |
| Prism Range | 5,000 m (16,400 ft) |
| Reflectorless | 1,000 m (3,280 ft) |
| Dist. Accuracy (Fine) | 1 mm + 2 ppm |
| Models | GT-1501 (1″) · GT-1502 (2″) · GT-1503 (3″) |
GT-700 Series
Versatile performance platform
The GT-700 shares the same rugged build, Brushless Direct Current motor technology, and field software as the GT-1500, but at a more accessible price point. With 4,500-meter prism range, 800-meter reflectorless, and 120-degree-per-second turning speed, the GT-700 is a workhorse for construction layout and survey.
| Motor Speed | 120°/sec (BLDC) |
| Prism Range | 4,500 m (14,760 ft) |
| Reflectorless | 800 m (2,624 ft) |
| Dist. Accuracy (Fine) | 2 mm + 2 ppm |
| Models | GT-702 (2″) · GT-703 (3″) · GT-705 (5″) |
Built for Survey and Construction
The GT series is designed to handle the full spectrum of positioning work, from high-precision surveying to fast-paced construction layout.
Survey
Applications
The GT-1500 series in particular excels in demanding survey workflows where accuracy and range are critical.
- Boundary and cadastral surveys
- Topographic mapping and data collection
- Control network establishment
- Construction monitoring and deformation surveys
- Highway and road alignment
- Utility location and as-built surveys
- ALTA/NSPS land title surveys
- Hybrid GNSS + robotic data capture
Construction Applications
Both the GT-1500 and GT-700 handle the full range of building and site construction layout tasks.
- Concrete and foundation layout
- MEP layout (mechanical, electrical, plumbing)
- Structural steel and masonry verification
- Fire protection and sprinkler layout
- Site grading and earthwork staking
- As-built verification and QA/QC
- Elevator shaft and vertical alignment
- Bridge and infrastructure layout
All GT Series Models
Every GT series model shares the same IP65 rugged enclosure, LongLink Bluetooth, UltraTrac tracking, and compatibility with Topcon Field, Topcon Digital Layout, and Pocket3D software. Select the accuracy level and platform that fits your work.
GT-1500 Series
200°/sec BLDC motors · 5,000 m prism range · 1,000 m reflectorless · 1 mm + 2 ppm fine accuracy
Topcon GT-1501
1″ Angular Accuracy
The highest-accuracy GT series model. One-second angular accuracy for high-order control surveys, precision monitoring, and projects where the tightest tolerances are non-negotiable.
| Dist. Accuracy (Fine) | 1 mm + 2 ppm |
| Prism Range | 5,000 m (16,400 ft) |
| Reflectorless | 1,000 m (3,280 ft) |
| Motor Speed | 200°/sec |
| UltraTrac Tracking | 1,000 m (3,280 ft) |
Topcon GT-1502
2" Angular Accuracy
The most popular GT-1500 model. Two-second accuracy balances survey-grade precision with the speed and range needed for construction layout, boundary surveys, and site control.
| Dist. Accuracy (Fine) | 1 mm + 2 ppm |
| Prism Range | 5,000 m (16,400 ft) |
| Reflectorless | 1,000 m (3,280 ft) |
| Motor Speed | 200°/sec |
| UltraTrac Tracking | 1,000 m (3,280 ft) |
Topcon GT-1503
3" Angular Accuracy
Three-second accuracy on the GT-1500 platform gives you the fastest motors and longest range at an accuracy level well-suited for construction layout and general surveying.
| Dist. Accuracy (Fine) | 1 mm + 2 ppm |
| Prism Range | 5,000 m (16,400 ft) |
| Reflectorless | 1,000 m (3,280 ft) |
| Motor Speed | 200°/sec |
| UltraTrac Tracking | 1,000 m (3,280 ft) |
GT-700 Series
120°/sec BLDC motors · 4,500 m prism range · 800 m reflectorless · 2 mm + 2 ppm fine accuracy
Topcon GT-702
2″ Angular Accuracy
Two-second accuracy on the GT-700 platform. A strong choice for contractors and surveyors who need reliable precision without stepping up to the GT-1500 price point.
| Dist. Accuracy (Fine) | 2 mm + 2 ppm |
| Prism Range | 4,500 m (14,760 ft) |
| Reflectorless | 800 m (2,624 ft) |
| Motor Speed | 120°/sec |
| UltraTrac Tracking | 800 m (2,624 ft) |
Topcon GT-703
3" Angular Accuracy
Three-second accuracy covers the vast majority of construction layout tasks. The GT-703 is a proven daily driver for mechanical, electrical, plumbing, and concrete contractors.
| Dist. Accuracy (Fine) | 2 mm + 2 ppm |
| Prism Range | 4,500 m (14,760 ft) |
| Reflectorless | 800 m (2,624 ft) |
| Motor Speed | 120°/sec |
| UltraTrac Tracking | 800 m (2,624 ft) |
Topcon GT-705
5″ Angular Accuracy
Five-second accuracy handles general building construction layout where sub-millimeter angular precision is not critical. An accessible entry point into the GT series.
| Dist. Accuracy (Fine) | 2 mm + 2 ppm |
| Prism Range | 4,500 m (14,760 ft) |
| Reflectorless | 800 m (2,624 ft) |
| Motor Speed | 120°/sec |
| UltraTrac Tracking | 800 m (2,624 ft) |
What Sets the GT Series Apart
Built from the ground up for demanding professionals, the GT series combines advanced motor technology, long-range capability, and hybrid-ready flexibility.
Brushless Direct Current Motors
The GT series uses intelligent BLDC motors instead of conventional servo or ultrasonic motors. BLDC motors deliver smooth, ultra-silent operation with significantly less mechanical wear. The GT-1500 achieves 200 degrees per second turning speed for faster two-face measurements and hybrid search. The GT-700 reaches 120 degrees per second.
Hybrid Positioning Ready
Combine your GT series total station with a Topcon GNSS receiver to create a Hybrid Positioning system. Seamlessly switch between robotic and GNSS measurement without changing software or workflows. When you lose line of sight or need to work under tree cover, GNSS takes over. When you need sub-millimeter precision, the total station handles it.
RC-5A Remote Re-Acquisition
On busy jobsites, obstacles frequently break the prism lock between the instrument and operator. The optional RC-5A remote control emits a fan-shaped laser beam that the total station detects and relocks to in seconds with a single tap in your field software. With 300-meter re-acquisition range, 600-meter LongLink communication, IP65 rating, and 40-hour battery life, the RC-5A keeps you moving.
UltraTrac Prism Tracking
UltraTrac combines optical sensing with high-speed BLDC motor control to maintain prism lock even in tough jobsite conditions. The GT-1500 tracks out to 1,000 meters and the GT-700 to 800 meters. Whether working at distance or up close, the instrument stays locked on so you can focus on layout rather than fighting the equipment.
Long-Range Reflectorless EDM
Measure to surfaces without a prism at distances up to 1,000 meters on the GT-1500 or 800 meters on the GT-700. Reflectorless measurement is ideal for as-built verification of hard-to-reach surfaces, facade documentation, and measuring to points where placing a prism is impractical or unsafe.
LongLink Bluetooth Reliability
Every GT series model features Topcon’s LongLink Bluetooth technology, delivering stable communication between the instrument and controller at distances up to 600 meters. Designed for active jobsites, it maintains a reliable connection with fewer dropouts so you can stay productive without interruptions.
GT Series Model Comparison
Specifications for all six GT series models.
| Specification | GT-1501 | GT-1502 | GT-1503 | GT-702 | GT-703 | GT-705 |
|---|---|---|---|---|---|---|
| Angular Accuracy | 1″ | 2″ | 3″ | 2″ | 3″ | 5″ |
| Distance Accuracy (Fine) | 1 mm + 2 ppm | 2 mm + 2 ppm | ||||
| Prism Range | 5,000 m (16,400 ft) | 4,500 m (14,760 ft) | ||||
| Reflectorless Range | 1,000 m (3,280 ft) | 800 m (2,624 ft) | ||||
| Max Turning Speed | 200°/sec | 120°/sec | ||||
| Max Tracking Speed | 20°/sec | 18°/sec | ||||
| UltraTrac Range (Prism) | 1,000 m (3,280 ft) | 800 m (2,624 ft) | ||||
| LongLink Bluetooth | 600 m (1,968 ft) | |||||
| Motor Type | Brushless Direct Current (BLDC) | |||||
| Dust/Water Rating | IP65 | |||||
| Hybrid Positioning | ✓ | |||||
| RC-5A Compatible | ✓ | |||||
| Weight (with handle/battery) | 5.9 kg / 6.0 kg (RC handle) | |||||
| Warranty | 3-year instrument, 5-year motor | |||||
Translating Total Station Accuracy to Inches
Positioning accuracy for 1″, 2″, 3” and 5” class instruments at common distances displayed in construction terms
Fractional inch rounded to nearest common fraction | Formula: offset = distance × tan(arcseconds × π / 648000)
| Distance away from RTS | 1″ Class | 2″ Class | 3″ Class | 5″ Class | ||||
|---|---|---|---|---|---|---|---|---|
| (ft) | Fraction | Decimal | Fraction | Decimal | Fraction | Decimal | Fraction | Decimal |
| 50 ft | < 1/16″ | 0.0029″ | < 1/16″ | 0.0058″ | < 1/16″ | 0.0087″ | < 1/16″ | 0.0145″ |
| 100 ft | < 1/16″ | 0.0058″ | < 1/16″ | 0.0116″ | < 1/16″ | 0.0175″ | < 1/16″ | 0.0291″ |
| 200 ft | < 1/16″ | 0.0116″ | < 1/16″ | 0.0233″ | < 1/16″ | 0.0349″ | 1/16″ | 0.0582″ |
| 400 ft | < 1/16″ | 0.0233″ | < 1/16″ | 0.0465″ | 1/16″ | 0.0698″ | 1/8″ | 0.1164″ |
| 600 ft | < 1/16″ | 0.0349″ | 1/16″ | 0.0698″ | 1/8″ | 0.1047″ | 3/16″ | 0.1745″ |
| 800 ft | < 1/16″ | 0.0465″ | 1/16″ | 0.0931″ | 1/8″ | 0.1396″ | 1/4″ | 0.2327″ |
| 1000 ft | 1/16″ | 0.0582″ | 1/8″ | 0.1164″ | 3/16″ | 0.1745″ | 5/16″ | 0.2909″ |
* Angular error only. EDM (distance measurement) error is separate: typically ±(1–3 mm + 1–2 ppm). Total positional error includes centering, atmospheric, and target effects.
* Common fractions used: <1/16″, 1/16″, 1/8″, 3/16″, 1/4″, 5/16″, 3/8″, 7/16″, 1/2″, 5/8″, 3/4″, 7/8″, 1″, 1-1/4″, 1-1/2″, 1-3/4″, 2″, 2-1/2″, 3″
Training and Resources
Site Precision produces step-by-step video training for Topcon Digital Layout software. Our library is growing every month, and every customer gets access from day one.
Trusted by Contractors Across the Midwest United States
Hear from professionals who have made the switch to robotic layout with Site Precision.
Mario and Brian are extremely knowledgeable about their products. Their customer service is the best of people I deal with. I won’t deal with anyone else when it comes to our laser/total station needs.
More Than Equipment. A Partnership.
When you purchase a robotic total station from Site Precision, you get expert support from day one and every day after.
When You Call, We Answer
Real humans pick up the phone. Our team is available during business hours to troubleshoot field issues, answer software questions, and help your crew stay productive.
In-House Service Department
Calibrations, repairs, and firmware updates handled right here in Grand Rapids. No shipping your instrument across the country and waiting weeks to get it back.
Loaner Units Available
If your instrument needs service, we provide loaner units so your project keeps moving. You should never have to stop work because your equipment is in the shop.
On-Site Training
Every purchase includes startup training at your location. We get your crew comfortable with setup, layout workflows, and software so they are productive from day one.
Remote Support
Need help in the field? Our team can connect remotely to walk through software questions, controller issues, or file management without waiting for a site visit.
Industry-Leading Warranty
Five-year motor warranty and three-year instrument warranty on all GT series models. Your investment is protected for years of demanding jobsite use.
Find the Right GT Series Model for Your Work
Schedule a hands-on demo at your jobsite or our Grand Rapids showroom.
We will help you choose the right model and get your crew trained and productive.