Global Navigation Satellite Systems (GNSS) have revolutionized the surveying industry. But even with powerful receivers and real-time correction services, user error remains a major factor behind poor accuracy, failed setups, and wasted time. Whether you’re a new surveyor or a seasoned professional, avoiding these common GNSS mistakes can save you hours in the field—and preserve your credibility.
1. Rushing Initialization (RTK Fix)
Getting an RTK fix is essential for high-accuracy results. Many users start collecting points too soon.
Avoid it: Wait for a full RTK fix (not float) before recording. Always verify fix quality on your receiver screen.
2. Not Checking Satellite Visibility
Poor satellite geometry (high PDOP) leads to weak position data, even with a good fix.
Avoid it: Use GNSS planning apps to check satellite availability before fieldwork—especially in urban or forested areas.
3. Ignoring Battery Levels
Survey crews often overlook charging protocols and field power checks.
Avoid it: Bring spare batteries and check power levels before leaving the office. Consider power banks for long surveys.
4. Incorrect Antenna Height Input
Even a small antenna height error (e.g., 5 cm) can skew vertical results significantly.
Avoid it: Measure from the ground to the ARP (antenna reference point) and double-check your input in the controller software.
5. Using the Wrong Coordinate System
Mixing up projections or datums leads to misaligned data that won’t match your project files.
Avoid it: Confirm the coordinate system in use before starting, and align with the client’s or local government’s standards.
6. No Base Station Verification
If using your own RTK base, a poorly placed or misconfigured base ruins everything downstream.
Avoid it: Install the base on a known point or verify its position using a long static session before starting work.
7. Overlooking Multipath Environments
Signals reflecting off buildings, vehicles, or fences (multipath) can silently degrade accuracy.
Avoid it: Keep receivers away from metal surfaces and reflective areas. Consider advanced GNSS systems like Trimble R12i that reduce multipath.
8. Blocking the Antenna
Holding the rover antenna too close to your body or tilting it unnecessarily affects signal reception.
Avoid it: Use a carbon pole and keep the antenna upright and away from obstructions.
9. Forgetting Firmware Updates
GNSS manufacturers release firmware updates to improve accuracy and constellation support.
Avoid it: Regularly check for and apply firmware updates for your receiver, controller, and base station.
10. Poor Field Notes & Documentation
No logs, no photos, no metadata—no chance to correct mistakes later.
Avoid it: Always record job details, base coordinates, point descriptions, and any anomalies in the field for QA/QC purposes.
Summary Table: GNSS Surveying Mistakes
| Mistake | Risk | Tip to Avoid |
|---|---|---|
| Rushing RTK fix | Low accuracy | Wait for full fix |
| Ignoring satellite planning | Bad positioning | Use a planning tool |
| Wrong antenna height | Vertical errors | Measure precisely |
| Multipath interference | Skewed positions | Avoid reflective areas |
| Outdated firmware | Missed features, bugs | Update regularly |
GNSS is powerful, but it’s not magic. Most of the problems I’ve seen in the field are human error. With a little awareness and discipline, you can go from ‘good enough’ to consistently accurate surveying.
Take Action
Before your next GNSS job:
- Plan your satellite window
- Double-check your settings
- Update your equipment
- Log everything
And if you’re in doubt, ask! The cost of a mistake is far higher than the time spent verifying.