Topcon GT-705 Robotic Total Station

The Entry Point Into Robotic Layout

The GT-705 is the most accessible model in the Topcon GT series and the easiest way to move a crew off traditional layout and into a robotic workflow. Five-second angular accuracy handles the majority of general building construction, fire protection, and site layout tasks where sub-millimeter precision is not required. You still get the full GT-700 platform: BLDC motors, rugged IP65 housing, Hybrid Positioning compatibility, and the industry-leading 5-year motor warranty.

Key Features

• Brushless Direct Current Motors: 120-degree-per-second rotation and 18-degree-per-second auto tracking from BLDC motors. Smoother, quieter, and longer-lasting than traditional servo designs.
• 5-Second Angular Accuracy: The right accuracy tier for general building construction, fire protection layout, site grading, and earthwork staking where survey-grade precision is not required.
• Full GT-700 Platform: Same 4,500-meter prism range, 800-meter reflectorless, Hybrid Positioning compatibility, and 2 mm + 2 ppm fine distance accuracy as the GT-702 and GT-703.
• UltraTrac Prism Tracking: Rock-solid prism lock at ranges up to 800 meters, even on busy jobsites.
• Hybrid Positioning Ready: Pair with a Topcon GNSS receiver for seamless switching between robotic and GNSS measurement without changing software.
• RC-5A Remote Compatibility: Single-tap prism reacquisition from up to 300 meters.
• LongLink Bluetooth: 600-meter communication range with RC-5A in open conditions.
• Rugged IP65 Rating: Fully dust- and waterproof. Operates from -20°C to 50°C. Built for daily jobsite use.
• Industry-Leading Warranty: The same 3-year instrument and 5-year motor warranty as every other GT series model. You do not give up durability coverage at this price point.

Robotic Layout at an Accessible Price

For crews still running manual total stations or working behind optical instruments, the GT-705 is the bridge into robotic layout without the jump to a premium accuracy tier. Five-second angular accuracy covers general building construction, site grading, concrete slab layout, and most interior layout work. You still run the same Topcon Digital Layout or Topcon Field software as crews on higher-tier GT models. That means when you scale up in the future, the workflow transfer is zero. Your field controllers, accessories, and trained staff all carry over.

Technical Specifications

• Angular Accuracy: 5" (0.0015 gon / 0.025 mil)
• Angle Display: 1" / 5" selectable
• Prism Range: 1.3 to 4,500 m (14,760 ft)
• Reflectorless Range: 0.3 to 800 m (2,624 ft)
• Distance Accuracy (Fine): 2 mm + 2 ppm
• Measuring Time: Fine 0.9s / Rapid 0.6s / Tracking 0.4s
• Max Rotation Speed: 120°/sec
• Max Auto Tracking Speed: 18°/sec
• UltraTrac Tracking Range: 1.3 to 800 m
• Motor Type: Brushless Direct Current (BLDC)
• Operating System: Windows Embedded Compact 7
• Display: 4.3" TFT VWGA color touchscreen
• Communications: Bluetooth Class 1 (600 m with RC-5A), USB 2.0, RS-232C
• Battery Life: Approximately 4 hours per BDC72 battery
• Environmental: IP65 dust and water resistant, -20°C to 50°C operating temperature
• Weight: 5.9 kg (normal handle) / 6.0 kg (RC handle)

Standard Kit Includes:

• GT-705 Total Station
• 2x BDC72 rechargeable lithium-ion batteries
• CDC77 dual battery charger
• Rugged hard carrying case
• Lens cap and tool kit
• Calibration certificate

Industry-Leading Warranty:

• 3-Year Instrument Warranty
• 5-Year UltraSonic Motor Warranty

Common Questions About the GT-705

What is the angular accuracy of the Topcon GT-705?
The GT-705 has 5-second (5") angular accuracy. At 100 feet, that translates to less than 1/16 inch of horizontal offset, appropriate for general building construction, fire protection, and site layout.

Is the GT-705 accurate enough for commercial construction layout?
Yes, for most general building tasks. Five-second accuracy covers slab layout, interior walls, fire protection, site grading, and MEP rough-in where tight angular precision is not the limiting factor. For precision concrete form layout, structural steel verification, or boundary surveys, step up to the GT-703 (3") or GT-702 (2").

What is the difference between the GT-705 and the GT-703?
The GT-705 has 5-second angular accuracy and the GT-703 has 3-second. Both use the same GT-700 platform (120°/sec motors, 4,500 m prism range, 2 mm fine distance accuracy). Choose the 705 when you do not need sub-5-second accuracy and want the lowest entry point into the GT series.

Does the GT-705 work with Hybrid Positioning?
Yes. Pair the GT-705 with any Topcon GNSS receiver to create a Hybrid Positioning system. Switch between robotic total station and GNSS measurement within the same field software.