GL-57 GNSS Data Backup Logger

The Steamrock GL-57 GNSS Data Backup Logger provides an automated, printed backup log to ensure your boat’s crucial navigational data is protected against complete electronics, NMEA network, or power failures.

Reliable Marine Navigation Backup

The Steamrock GL-57 is a rugged, standalone backup device that decodes and prints hard copies of satellite navigational data. It seamlessly tracks GPS, Galileo, and GLONASS networks to guarantee independent positioning validation and record-keeping.

Automated Hourly Logging

Once every hour, the device automatically generates a physical printed log. Each log includes critical navigation metrics and a digital recovery option:
• Core Data: Exact Date, Time, and Coordinates.
• Boat Dynamics: Speed Over Ground (SOG) and Course Over Ground (COG).
• Movement History: Speed Made Good (SMG) and Course Made Good (CMG).
• Instant Digital Scanning: A built-in QR code lets you instantly scan the printed data.

Dependable Standalone Design

Built for ultimate resilience on the water, the GL-57 operates fully outside of your primary electronics network:
• No Network Needed: Functions without an internet connection or NMEA 2000/0183 backbone.
• Active Signal Capture: Utilizes a dedicated external active GNSS antenna for uninterrupted satellite tracking.

Heavy-Duty Marine Power Protection

Engineered to survive harsh marine electrical environments, the logger hooks directly into your boat’s 12V/24V power supply. Integrated smart circuitry protects the device against:
• Overvoltage and overcurrent surges
• Reverse polarity and power spikes
• Internal overheating issues

Instant Diagnostic Alerts

The GL-57 GNSS Data Backup Logger uses smart LED indicators, audible sound alerts, and printed system error messages to instantly notify you of satellite signal drops, self-diagnostic issues, or power supply abnormalities.

OWNER’S MANUAL

SHIPPING POLICY

FAQ

SPECIFICATIONS

Dimensions                                                                111 x 89 x 73.5 mm (4.37″ x 3.50″ x 2.90″)
Weight                                                                        270 g (without paper roll and Antenna)
Power Supply                                                             12 / 24 VDC
Average power consumption, including antenna       < 26 mA @ 12 VDC      < 21 mA @ 24 VDC
Pulse peak DC amperage (< 0.1 s)                           < 2.8 A
Fuse                                                                           2 A

GNSS Subsystem:

Constellations                                                           GPS, Galileo, GLONASS
GNSS module sensitivity                                          up to -163 dBm
Startup time                                                              3 ~ 15 minutes

GNSS signal quality level (DRMS ~ 95%) / positioning error:

Good                                                                         < 30 m
Poor                                                                          30 ~ 90 m
Bad                                                                            > 90 m

Thermal paper:

Width                                                                        58 mm
Max. roll diameter                                                     60 mm
Thickness                                                                 0.07 ~ 0.08 mm
Consumption (1 roll Ø 50 mm 18 m)                        10 ~ 12 days

OPERATING LIMITS

Power supply operating range                                 8 ~ 32 VDC
Max. power wires resistance                                   ≤ 1 Ω @ 12 VDC     ≤ 2 Ω @ 24 VDC
Surge protection                                                      up to 240 VAC / up to ± 600 VDC
Temperature                                                            0 ~ 55 °C (32 ~ 131 °F)
Humidity                                                                  < 95%
Max. linear acceleration (Vertical / Horizontal)       4.5 g

PACKAGE CONTENTS

1. Steamrock GNSS Logger GL-57                        1
2. GNSS antenna                                                   1
3. Owner’s manual                                                 1
4. Thermal paper roll 58 mm x 18 m                      1
5. Cutout template                                                  1
6. Hex wrench                                                        1
7. Cable tie                                                             2

Made in Taiwan