Frequently Asked Questions
Uploading and File Handling
What is the maximum file size I can upload?
LogHat supports large file uploads using a chunked, resumable upload method. There is no hard size limit — files exceeding 1GB are supported. Upload time will vary based on your internet connection speed. For very large files, the upload uses parallel chunk transfers (multiple 4MB segments simultaneously) to maximize throughput.
If your internet connection drops during an upload, the transfer will resume automatically from the last successfully uploaded segment when you revisit the dashboard.
What file formats does LogHat accept?
LogHat accepts ArduPilot DataFlash logs (.bin, .log, .tlog) and PX4 ULog files (.ulg, .ulog). Both flight stacks are fully supported. LogHat auto-detects the format on upload — no conversion required.
Is my log file kept private?
Yes. Log files are stored in a private, access-controlled cloud storage system. Your logs are associated with your account and are not accessible to other users. LogHat does not use your flight data to train AI models or share it with third parties. Files are stored using secure cloud infrastructure with per-user access controls.
For added confidence: processed analysis data is all that is needed to use the LogHat platform after your first upload. Your raw .bin file is retained only for the purposes of report generation and re-analysis.
Can I delete a log file after uploading it?
Log management controls are available in the Logs page of the dashboard. You can remove a flight entry from your flight history. Refer to the in-app controls for the most current deletion workflow, as this feature may be updated.
Analysis and Health Score
How does the AI health score work?
The health score starts at a maximum of 100 points and applies deductions based on specific anomalies detected in your log data. Deductions are applied across four dimensions: vibration levels, EKF health, GPS signal quality, and the presence of critical system alerts. The deductions are deterministic — the same log file will always produce the same score. No generative AI is used to calculate the score itself; it is a rules-based engineering assessment. The Vector AI chatbot uses a language model for conversational interaction, but the score is separate.
See AI Flight Health Score for a detailed breakdown of the scoring criteria.
What firmware versions are supported?
LogHat is tested against ArduPilot firmware version 3.5 and above. Modern firmware versions (4.x series) are fully supported and produce the richest analysis results, as they log additional diagnostic parameters that LogHat reads. Older firmware versions may produce logs with missing message types, which will result in those health dimensions being skipped rather than scored (not penalized).
What happens if log analysis fails?
If your log file uploads successfully but the analysis pipeline encounters an error (for example, if the file is corrupted, incomplete, or contains an unsupported message structure), your flight will show a Failed status in the logs list. Common causes include:
- Log file was truncated due to SD card removal while the flight controller was still powered
- SD card write errors during logging
- Non-standard firmware variants with altered message formats
In these cases, you can try re-uploading the file. If the failure persists, the issue is most likely in the source log file itself. You may be able to partially review the log using Mission Planner's local log review tools even if LogHat cannot fully process it.
Can I re-analyze a log after uploading?
Re-analysis of an existing log (for example, after a LogHat processing engine update) is a feature under development. If you need the most current analysis of a previously uploaded log, downloading the original .bin and re-uploading it is the current workaround.
Exporting Logs from Ground Stations
How do I export a log from Mission Planner?
- Connect your flight controller via USB and open Mission Planner.
- Click Connect in the top right to establish communication.
- Navigate to the DataFlash Logs menu.
- Select Download DataFlash Log Via Mavlink.
- Choose the log from the list and click Download Selected Logs.
- Save the resulting
.binfile to your computer.
Alternatively, you can remove the SD card and copy files directly from APM/LOGS/ on the card.
How do I export a log from QGroundControl?
- Connect your vehicle to QGroundControl.
- Open the application menu and navigate to Analyze Tools → Log Download.
- Select the desired log file from the list.
- Click Download and save the file to your computer.
AI and Reports
What is Vector AI?
Vector AI is LogHat's conversational engineering assistant. You can ask questions about your flight in plain English — for example, whether there were EKF anomalies, whether battery sag occurred during a specific phase, or what caused an altitude oscillation. Vector AI responds with answers grounded in your telemetry data. It is available on paid plans.
What does the Forensic PDF Report contain?
The PDF report has 10 sections: (1) Flight summary with overall grade, (2) System health traffic-light summary, (3) EKF analysis, (4) Battery profile, (5) Open-Meteo weather at your flight location and time, (6) Motor balance check, (7) Vibration analysis, (8) GPS health, (9) Annotated anomaly log, and (10) Prioritised maintenance action plan. PDF reports are available on paid plans.
Account and Access
Can I use LogHat without creating an account?
Yes. The guest mode at loghat.app/guest allows you to upload a .bin file and receive a 3D replay without creating an account. Guest processing runs locally in your browser using a built-in log parser. This means your log data is never sent to LogHat's servers in guest mode.
Guest mode has the following limitations:
- A maximum of 3 log uploads per session (per device)
- No PDF report download
- No flight history
- No fleet management
- No cross-flight comparison
Can I share my analysis results with a team member?
Yes, in two ways:
-
Share Link — On any flight's view page, click the Share button in the header. This generates a unique, secure URL that anyone can use to view the full 3D replay and flight data without needing a LogHat account. You can revoke the link at any time.
-
PDF Report — The downloadable forensic PDF report is a standalone document that can be opened by anyone. Share it via email, Slack, or any file-sharing service.
What is the Founding Pilot trial?
Every new account receives 6 months of full Pro access with 50 flight credits — no credit card required. During the trial, you have access to all features: 3D flight replay, Vector AI chat, forensic PDF reports, fleet management, and WhatsApp notifications. After the trial period, you can purchase additional flight credits from the Pricing page.
How do flight credits work?
Each log analysis consumes 1 flight credit. Each Vector AI chat query consumes 0.1 credits. Cloud storage and PDF exports are free. You can check your credit balance in the dashboard header and top up anytime via the Pricing page or by entering a coupon code.
What are referral codes?
Every pilot gets a unique Pilot Code shown on their dashboard. When another pilot signs up and applies your code, both of you receive bonus flight credits. Share your code with fellow drone operators to earn free analysis credits.
How do WhatsApp notifications work?
After verifying your WhatsApp number via OTP (prompted on your first login), Vector AI will send you real-time notifications when your log upload starts processing and when analysis is complete. You will also receive alerts for low credit balance and payment confirmations.
Technical and Browser Compatibility
What browsers does LogHat support?
LogHat is optimized for modern browsers. The following are fully supported:
| Browser | Minimum Version | |---|---| | Google Chrome | 90 and above | | Mozilla Firefox | 88 and above | | Microsoft Edge | 90 and above | | Safari (macOS / iOS) | 14 and above |
The 3D replay view uses WebGL and requires hardware-accelerated graphics. If your browser has WebGL disabled or your device does not support it, the 3D view will not render. For best performance, use Chrome or Edge on a device with a dedicated GPU.
Internet Explorer is not supported.
Does LogHat work on mobile devices?
LogHat is accessible on mobile browsers and the interface is responsive for smaller screens. However, the 3D replay viewer is performance-intensive and may run at reduced frame rates on lower-powered mobile devices. For the best analytical experience, a desktop or laptop computer is recommended.
How large can the log file be for browser-based local processing (guest mode)?
In guest mode, the .bin file is parsed entirely within your browser. This is limited by the available RAM and processing power of your device. A typical modern laptop or desktop can handle log files up to approximately 200–400MB without significant performance issues. Larger files may cause the browser to slow down or run out of memory. For files above 200MB, creating a free account and using cloud processing is strongly recommended.
Next: Glossary — definitions for technical terms used throughout LogHat documentation.