Marine Satellite Speed Log SDME

Marine Satellite Speed Log SDME GSL9000
Satellite speed logs have become increasingly important in the maritime industry over the past few years in monitoring vessel speed and distance travelled. They are also known as Speed and Distance Measuring Equipment, or SDME.
So what are satellite speed logs and how do they work? Essentially, these devices use satellite signals to determine a vessel's speed and distance travelled through water. They work by emitting a signal from the vessel which is then picked up and reflected back by satellites. The speed log then measures the time it takes for the signal to travel from the vessel to the satellite and back again, and uses this to calculate the vessel's speed and distance travelled.
This product is a navigation instrument to measure the ship's speed and accumulated voyage. It provides precise position information and speed and direction information for ship owners, and realises the display and warning of ship's movement status information.

As a professional Speed and Distance Measuring Equipment (SDME) compliant with international standards like IEC 61023, the Marine Satellite Speed Log SDME is engineered to resolve the most frustrating navigation challenges faced by mariners, skippers, and vessel operators every day. Unlike traditional electromagnetic or Doppler speed logs that struggle with fouling, shallow water inaccuracies, or complex maintenance, this satellite-based system leverages GNSS technology to deliver reliable, high-precision speed and distance data-eliminating the guesswork that puts voyages at risk and cuts into operational efficiency. It directly addresses the core issues mariners face: inconsistent speed readings in rough seas, inaccurate data during low-speed berthing, signal interruptions in coastal or congested waters, and the hassle of frequent maintenance. Whether you're navigating a large commercial vessel needing precise speed data for SOLAS compliance, a coastal fishing boat tracking fuel efficiency, or a cargo ship requiring accurate distance logs for voyage planning, this device adapts to your needs. It provides real-time longitudinal and transverse speed (even at the bow and stern), integrates seamlessly with ECDIS, radar, and AIS systems, and operates without mechanical parts-meaning less downtime and no repeated maintenance costs.

Benefits:
Firstly, they are accurate and reliable, providing real-time data on a vessel's speed and distance travelled. This can be crucial in a range of situations, such as when navigating through busy shipping lanes or during bad weather. It can also help shipping companies to optimize their routes and reduce fuel consumption, as well as providing vital information for reporting and compliance purposes.
In addition, satellite speed logs are easy to install and maintain, and can be integrated with other onboard systems. This means that vessel operators can access a range of data and information in one place, simplifying navigation and monitoring processes.

Product Features:

• Scientific analysis algorithm, accurately decompose the information of transverse motion of bow and stern.
• No mechanical parts, maintenance-free, no recurring costs, simple installation
• Multiple NMEA0183 outputs provide highly accurate and precise ship motion information for radar, plotter, auto rudder, fish finder, sonar and other marine navigation equipment.
• Supports CAN output, heading, position, speed, mileage and attitude output.
• The equipment is not affected by water temperature and salinity, and needs to be protected against windy and stormy sea conditions.
• Optional 7 inch color touch screen display unit, providing SDME and compass dual mode, more intuitive data, more convenient equipment.

Technical parameters：

1. General

2. Interface

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3.Environmental conditions

Application Guide

Getting Started: Initial Setup
Before launching your voyage, spend 15 minutes setting up the Marine Satellite Speed Log SDME to ensure optimal performance. Start by mounting the satellite antenna in a location with a clear view of the sky (avoiding masts, cranes, or other obstructions) and secure it with the included bracket. Connect the antenna to the junction box using the 20-meter cable, then plug the junction box into the vessel's 12/24V power supply. Optional a 7-inch display unit, and connect the 7-inch display unit to the junction box.Turn on the device and follow these steps: 1) Choose your preferred units (knots for speed, nautical miles for distance). 2) Enable multi-constellation mode to ensure reliable satellite reception. 3) Adjust the speed filter to medium (2-3 seconds) to balance accuracy and stability. 4) Calibrate the display brightness for your bridge conditions (use the dimmable backlight for low-light or bright sunlight). Finally, run a self-test to confirm the device is transmitting data correctly-this takes 1-2 minutes and ensures compliance with maritime standards.

Using the Device During Voyages

- Integrate with navigation systems: Ensure the device is transmitting data to your ECDIS, radar, and AIS-this enhances collision avoidance and route optimization. Check the data transmission status regularly (via the menu) to confirm all systems are receiving accurate speed and distance data.
- Track fuel efficiency: Use the distance and speed logs to calculate fuel consumption-correlating speed with engine output helps you identify the most fuel-efficient speed for your vessel, reducing operational costs.
- Handle signal interruptions: If satellite signal is lost (indicated by a warning on the display), slow down slightly and move to an area with unobstructed sky. Enable multi-constellation mode to regain signal faster, and avoid relying solely on the device during signal gaps-use backup navigation tools if needed.

FAQ

 

 

01. Why are my speed readings inconsistent, especially in coastal or congested waters?

Inconsistent readings in coastal or busy waterways typically stem from two common issues: satellite signal obstruction or incorrect system configuration-both easy to resolve. First, check the antenna placement: the satellite antenna needs a clear line of sight to the sky, so make sure it's not blocked by masts, cranes, or other onboard equipment. If you're navigating near tall buildings, cliffs, or dense ship traffic, the device may temporarily lose satellite lock; enabling the multi-constellation mode (GPS, GLONASS, Galileo, and Beidou) will help maintain signal strength by switching to available satellites. Second, verify the speed filter setting: if set too low, it will pick up minor vessel movements (like waves or currents) as speed changes. Adjust the filter to a medium level (2-3 seconds) to smooth out fluctuations while retaining accurate real-time data. Additionally, check if the device is set to the correct speed type-SOG (Speed Over Ground) for open waters or STW (Speed Through Water) if you need to account for currents; mixing these up can cause confusing readings.

02. Will this SDME device comply with international maritime regulations for my vessel?

Yes-this Marine Satellite Speed Log SDME is fully compliant with key international standards, including IEC 61023 (SDME standard) and ISO 22090-3 (Transmitting Heading Device standard), as well as IMO MSC.334(90) requirements. For vessels over 50,000 GT constructed on or after July 1, 2014, it meets the requirement for a separate SOG (Speed Over Ground) device, and it works seamlessly with Voyage Data Recorders (VDR) to ensure compliance with SOLAS regulations. Whether you operate an internationally voyaging commercial vessel over 300 GT or a smaller coastal vessel, this device provides the accurate speed and distance data required for inspections and safe navigation. It also features a built-in self-test function that logs compliance data, making it easy to demonstrate adherence during maritime audits.

03. How do I install the device, and do I need professional assistance?

You don't need professional help for basic installation-most vessel operators can set up the system in 1-2 hours with standard onboard tools. The package includes a compact satellite antenna (easy to mount on the vessel's roof or mast), a junction box and a 7-inch color LCD display (for bridge installation), and all necessary cables and mounting hardware. The antenna mounts with a simple bracket-just ensure it's positioned facing the sky, away from obstructions, and grounded properly to avoid interference. The junction box connects to the antenna via a 20-meter cable and plugs into the vessel's 12/24V power supply; no complex wiring is required.

04.Does the device work at very low speeds for berthing operations?

Absolutely-this is one of the device's key strengths. It delivers exceptional accuracy even at dead slow speeds, which is critical for precise berthing and docking of large vessels. Unlike Doppler speed logs that lose accuracy at low speeds, the satellite-based technology tracks even the smallest vessel movements, providing real-time speed data that helps you maneuver safely alongside docks or other vessels. The display features a clear, high-legibility interface with large characters, so you can easily read speed readings even in bright sunlight or low light. For added convenience, you can switch to a dedicated berthing display mode that highlights transverse and longitudinal speeds, giving you full control over the vessel's movement during these critical operations. This low-speed accuracy also makes it ideal for fishing vessels that need to maintain a steady speed while trawling.

05. Can the device integrate with my existing navigation systems (ECDIS, radar, AIS)?

Yes-it's designed to integrate seamlessly with most modern marine navigation systems, including ECDIS, radar, AIS, and VDR. It features three IEC 61162-1 interfaces, which allow it to transmit speed, distance, and vessel attitude data (roll, pitch, and angular information) directly to these systems. This integration enhances overall navigation safety: for example, radar and AIS use the device's speed data to improve collision avoidance calculations, while ECDIS uses it to optimize route planning and estimate arrival times. The setup is simple-just connect the device to your navigation system via the included cables, and use the menu to select the data you want to transmit. It also supports NMEA 0183 and NMEA 2000(optional) protocols, ensuring compatibility with both older and newer navigation equipment.

06. What should I do if the device stops receiving satellite signals?

First, check the antenna's line of sight-if it's blocked by onboard equipment, weather, or nearby structures, move the antenna to a more open position or wait until you're in an area with unobstructed sky. Next, verify the antenna connection: ensure the cable is securely plugged into both the antenna and the display unit, and check for any cuts or frays in the cable (corroded or damaged cables can disrupt signal). If the signal is still weak, enable the multi-constellation mode (found in the system menu) to access more satellites-this is especially helpful in coastal areas or during cloudy weather. You can also check the satellite status on the display, which shows the number of satellites being tracked; you need at least 5 satellites for maximum accuracy. If none of these steps work, perform a system reset (via the menu) to refresh the signal receiver-this often resolves temporary glitches. For persistent issues, use the remote maintenance feature to have a technician troubleshoot from shore.

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