Precision starts with orientation.
A growing body of research confirms it: poor sensor alignment— often caused by the use of magnetic compasses —undermines seismic data quality. Modern gyrocompasses stand out with sub-degree accuracy, meeting the demands of advanced seismic analysis techniques such as wave polarization, array-derived rotation, and moment tensor inversion. But challenges remain: weight, cost, and the need for practical solutions to transfer gyrocompass headings to station instruments.
That’s why Maagm proposes you NJORD, a comprehensive product line for true North station orientation. From precision gyrocompasses to alignment toolkits : NJORD ensures your instruments to be aligned properly.
Quadrans: True North Finder
is a compact, dual-use optical gyrocompass and AHRS, designed to deliver true north finding in a lightweight. With low power consumption (6W) and robust performance, it’s ready for deployment anywhere—onshore or offshore. Quadrans offers 0.15° RMS heading accuracy and 0.02° RMS roll/pitch accuracy (with GNSS), ensuring reliable attitude data for a wide range of maritime operations. Its Smart Heave capability (5% or 5 cm RMS, whichever is greater) makes it a versatile solution for marine navigation, advanced platform stabilization, and offshore engineering missions.
Atlans 3: North Keeper
is a compact, export-free FOG-based INS solution designed for land-based navigation and mapping applications. Operating at just 4W, it delivers precise and reliable orientation and positioning even in GNSS-challenged environments. While it does not offer north-finding capability, Atlans 3 integrates GNSS and DMI aiding to ensure high-accuracy performance on the move. With GNSS RTK, it provides 0.025° RMS roll/pitch and 0.05° RMS heading accuracy. In GNSS outage scenarios, it maintains real-time position drift within 0.80 m (1 min), and just 0.20 m when post-processed—making it ideal for mobile mapping, road asset management, and geospatial data collection.
Octans 9: True North Finder
is a high-performance, export-free optical gyrocompass and AHRS, delivering true north finding with unmatched precision. Designed for demanding maritime environments, it combines compact form factor and ultra-low power consumption (6W), making it ideal for integration on any platform. With a heading accuracy of 0.05° RMS and roll/pitch accuracy of 0.006° RMS (with GNSS), it ensures reliable orientation and motion data—even in challenging offshore conditions. Smart Heave output (2% or 2 cm RMS, whichever is greater) further enhances its performance for applications such as marine navigation, high-end platform stabilization, and offshore engineering.
Åstrakal: Dual Antenna GNSS True North Finder
is an export-free, ultra-light (2W) dual-antenna GNSS-based heading solution, delivering precise true north determination without magnetic interference. Compact and power-efficient, it offers high-accuracy RTK positioning and can maintain heading for up to 20 minutes during GNSS outages. With plug-and-play support for NMEA 0183, NMEA 2000, and Ethernet interfaces, Åstrakal is ideal when you need station orientation having an open-sky.
| Feature / Product | Octans 9 | Quadrans | Atlans 3 | Åstrakal |
| Type | AHRS / Optical Gyrocompass | AHRS / Optical Gyrocompass | INS + GNSS (FOG-based) | GNSS True North Finder |
| North Finding | ✔ True North | ✔ True North | ✔ North Keeper | ✔ Dual GNSS True North |
| Export Restrictions | Export-free | Dual-use | Export-free | Export-free |
| Power Consumption | 6W | 6W | 4W | 2W |
| Heading Accuracy (with GNSS) | 0.05° RMS | 0.15° RMS | 0.05° RMS (with GNSS RTK) | 0.2° RMS |
| Roll & Pitch Accuracy | 0.006° RMS (with GNSS) | 0.02° RMS (with GNSS) | 0.025° RMS (with GNSS RTK) | 0.4° RMS |
| Smart Heave | 2% RMS or 2 cm | 5% RMS or 5 cm | N/A | 5% RMS or 5 cm |
| Realtime Drift (1 min GNSS Outage) | N/A | N/A | 0.80 m (real-time) | N/A |
| Postprocessed Drift (1 min) | N/A | N/A | 0.20 m | N/A |
| Aiding Sensors | N/A | N/A | GNSS, DMI | GNSS, DMI |
| Interfaces | Ethernet, RS232, RS422, CAN | Ethernet, RS232, RS422, CAN | Ethernet, RS232, RS422, CAN | Ethernet, RS232, NMEA 0183/2000 |
| Special Features | FOG AHRS with exceptional precision | Compact gyrocompass | RTK-enhanced INS with low drift | Dual GNSS antennas, RTK-ready, low power |
Åligner: Laser Alignment Kit for Optical Gyrocompasses
It projects a laser line aligned with the heading of the gyrocompass mounted on the tripod.
Åligner is a highly accurate and portable alignment solution designed to ensure optimal orientation of stations equipped with gyrocompasses, such as the Octans 9, Quadrans, Atlans 3, and Åstrakal products. This laser alignment kit is specifically developed for demanding field operations, providing quick, reliable, and reproducible setup.
💡 Complete, Ready-to-Use
The kit includes:
- A mechanical alignment system with factory-calibrated laser line
- An adjustable tripod (height, roll, azimuth, pitch)
- A tablet with a dedicated GNSS transmission app
- A TP-Link Wi-Fi access point, pre-configured
- A multifunction field battery (power supply, lamp, charge indicator)
- A waterproof backpack for easy transport
🎯 Precision Alignment
The Åligner allows for precise positioning of the gyrocompass, with millimetric accuracy, thanks to its indexing pins and laser system. It facilitates alignment with true north, even without GNSS, by offering manual or automatic adjustment options. This system is fully compatible with Exail gyrocompasses and equivalents, as well as Octans 9, Quadrans, Atlans 3, and Åstrakal systems, allowing for precise adjustments for optimal performance.
📡 Smart Connectivity
The kit operates in a closed network via Wi-Fi, enabling GNSS data transmission and real-time monitoring of orientation parameters (azimuth, roll, pitch). This feature allows Åligner to be synchronized with other navigation systems, ensuring precise alignment and centralized data management.
🔁 Intuitive Field Use
The tripod setup is quick and secure. The user-friendly interface, accessible via the tablet, allows smooth control of the alignment process, with clear status indicators (in progress or completed). Thanks to its ergonomic design, Åligner is an indispensable tool for fast, reliable deployment in the field, complementing other navigation systems in the MAÅGM range.
🧭 Optimized for Optical Gyrocompasses
The alignment kit is specifically designed for optical gyrocompasses such as Exail or other compatible models, and can be provided with or without a gyrocompass. It easily adapts to these systems with customizable network settings, offering a flexible and high-performance solution.
This Åligner product perfectly complements the Octans 9,Quadrans, Atlans 3, and Åstrakal by offering a high-precision alignment solution, ideal for ensuring optimal performance of your optical gyrocompasses in complex environments.