GS-25 GPS Antenna

The GS-25 antenna is a high-performance GPS receiver that provides positioning, speed, heading, and attitude data to your marine network. It is ideal for high-speed navigation and radar overlay on your multifunction displays.

The antenna provides a very fast refresh rate of 10 Hz (10 times per second), ensuring smooth and real-time updates of your position, speed over ground (SOG), and course over ground (COG).

Yes, it includes a heading sensor that provides magnetic data with an accuracy of +/- 3°, as well as detailed information on the rate of turn, roll, and pitch of the boat.

While the GS-25 provides very useful heading data for radar overlay and chart mapping orientation, Simrad recommends using a dedicated stabilized compass, such as the Precision-9, for demanding applications like autopilot course keeping.

The GS-25 provides excellent horizontal accuracy of 3 meters (9.8 feet) thanks to its high-performance 32-channel receiver.

Cold start time is about 50 seconds. Under normal use, start time is only 3 seconds, and satellite signal reacquisition after a loss takes just 5 seconds.

Yes, the antenna is IPX7 certified. It is fully protected against heavy water spray and temporary immersion, making it perfectly suitable for outdoor installation on a boat.

The antenna is very compact: it measures 90 mm in diameter and 38 mm in height, and weighs only 0.14 kg.

The antenna is powered directly by the NMEA 2000 network. It accepts a voltage of 9 to 18 V DC and is distinguished by its very low power consumption (less than 2 W, or less than 100 mA at 12 V).

The GS-25 is equipped with a standard Micro-C connector for direct and easy connection to your NMEA 2000 backbone network.

No, the antenna does not plug directly into the display. It must be connected to an existing NMEA 2000 backbone network and properly powered to transmit its data to all onboard devices.

Yes, since it uses the standard NMEA 2000 communication protocol, it can transmit its position and heading data to any NMEA 2000-compatible display or instrument, regardless of brand.

No, the GS-25 antenna is exclusively designed for NMEA 2000 networks. To use it with equipment that only supports NMEA 0183, an external NMEA 2000 to NMEA 0183 converter would be required.

Yes, the antenna has built-in reverse polarity protection, which safeguards the device in case of wiring errors on the power network.

The GS-25 transmits numerous NMEA 2000 PGNs, including fast position (129025), COG and SOG (129026), compass heading (127250), rate of turn (127251), attitude (127257), and satellite data (129540).

Yes, since the GS-25 integrates a magnetic heading sensor, it is strongly recommended to perform a compass calibration at sea via your multifunction display to compensate for the magnetic deviations of your boat and ensure optimal accuracy.

Yes, the GS-25 receiver is compatible with multiple global satellite navigation systems (GNSS), allowing it to track a greater number of satellites to improve positioning accuracy and reliability.

The antenna should be installed in an open area with a clear 360° view of the sky. Due to its integrated compass, it must also be kept away from large metal structures, VHF or radar antennas, and any sources of magnetic interference such as engines or speakers.

The Simrad GS-25 antenna stands out with its ultra-fast 10 Hz refresh rate and 32-channel receiver, providing very smooth updates of position and speed. Unlike a standard GPS, it also integrates a magnetic heading sensor (accuracy +/- 3°) along with rate-of-turn and attitude sensors (roll and pitch). These additional data enable features such as radar overlay and precise map orientation.

The GS-25 antenna is very compact (90 mm in diameter and 140 grams) and offers two mounting options to suit your vessel:

Flush mount: ideal for a discreet, flat installation directly on the deck or cabin roof.
Standard pole mount: perfect for elevating the antenna on a support to avoid obstacles and optimize satellite signal reception.
For connection, it plugs directly into your NMEA 2000 network via a standard Micro-C connector.

While the GS-25 provides useful heading data for chart orientation and radar overlay, it is not designed as a primary sensor for demanding autopilot systems. For optimal course-keeping under autopilot, especially in rough sea conditions, Simrad recommends pairing your system with a dedicated stabilized heading sensor such as the Precision-9 compass.