The Trimble Catalyst (DA2) is a high‑precision GNSS device. Following these field best practices will help ensure that you achieve the maximum possible precision, reduce signal interruptions, and capture accurate data within Locusview.
Important Note: GNSS technology requires a direct line-of-sight to satellites for optimal performance. If you are experiencing poor accuracy, your first step should always be to check your surroundings for overhead obstructions.
Prerequisites
- A Trimble Catalyst (DA2) GNSS Receiver.
- A survey pole OR a Catalyst Handle setup for handheld use.
- The Locusview mobile app.
Field Use Best Practices
Click on a section below to expand the details:
1. Proper Physical Setup
- Attach the Antenna Correctly: Ensure the DA2 is securely attached to your survey pole or handheld mount. When installed correctly, the antenna should sit completely flat and conceal the yellow thread adapter.
- Clear Line of Sight: The DA2 requires a clear, unobstructed view of the sky. If using a pole, mount the receiver high enough so its line of sight is not blocked by your body. If using handheld mode, hold the unit away from your chest and head.
2. During Operation & Mapping
- Utilize Tilt Compensation (But Stay Reasonable): While the DA2 features tilt compensation to assist with accuracy when the device isn't perfectly straight, you should still aim to keep your survey pole as vertical as possible (using the level bubble) for the absolute best results when capturing a point.
- Always Face the Sky (Handheld Mode): If you are using the DA2 in handheld mode, ensure the "puck" (antenna) maintains a clear view of the sky. While minor tilting is compensated for, holding it completely sideways (like a TV remote) or upside down will block satellite signals and degrade your accuracy.
- Carry the Antenna Upright: Maintain good orientation when walking between points of interest. Do not carry a survey pole horizontally resting on your shoulder, and do not let your handheld unit point at the ground. Pointing the antenna away from the sky drops your tracked satellites and forces the DA2 to constantly recalculate its position, slowing you down.
3. Environmental Factors
- Beware of Trees and Buildings: Trees, dense foliage, and tall buildings can obstruct or bounce (reflect) satellite signals, which introduces errors and lowers precision.
- Allow Time to Converge: If you must work in an obstructed environment (like under a tree canopy), stand still and pay close attention to the precision estimate in Locusview. Give the receiver extra time to "converge" on a high-precision solution before capturing your point.
- Step Out to Recover: If your precision completely drops, step out of the obstructed area into an open space to allow the receiver to re-establish a strong signal before returning to your work area.
Troubleshooting Tips
| Issue | Potential Solution |
|---|---|
| Inaccurate Point Locations | While the unit compensates for minor tilting, extreme leaning will still cause the plotted point to be offset from the actual ground location. Ensure your survey pole or handheld unit is reasonably vertical when capturing points. |
| Losing Accuracy Between Captures | Make sure you are carrying the unit upright while walking. Carrying a pole on your shoulder or tilting a handheld puck downwards disrupts satellite tracking and forces the DA2 to re-acquire signals when you stop. |
Additional Notes and Best Practices
- Patience is Key: In urban canyons or heavily wooded areas, it is completely normal for precision to temporarily drop. Pausing for a moment in a clear area usually resolves the issue.
FAQs
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Q: Can I use the DA2 receiver indoors or inside a vehicle?
A: No. GNSS requires a direct line of sight to the sky. It will not work accurately indoors, under heavy metal roofs, or inside a vehicle.