Overview

The Simrad 000-11043-002 is a GS25 GPS antenna with a built-in heading sensor that puts position, speed, and magnetic heading on your NMEA 2000 network. It supports update rates up to 10 Hz and runs from the network supply (9 to 18 V DC) with a 2 LEN load, so it fits cleanly into standard 12V systems and many 24V installations through the NMEA 2000 backbone power.

On board, it is commonly mounted on a hardtop, radar arch, or a clear patch of deck where it can see the sky. The heading output helps stabilize the chart at low speeds and keeps radar overlay lined up when you are maneuvering. It is not a replacement for a rate compass for MARPA or autopilot steering functions that require that class of sensor.

The housing is IPX7 waterproof and low-profile (90 mm diameter x 38 mm height), which helps when you want an external antenna without adding much windage.

Key features

• Up to 10 Hz position updates (selectable 1, 5, or 10 Hz) for smoother tracking on fast boats and during close-quarters maneuvering.
• 32-channel receiver with multi-satellite support (GPS and GLONASS) plus differential corrections including WAAS, EGNOS, and MSAS.
• Position accuracy listed at 3 m (9.8 ft) under typical conditions.
• Integrated solid-state heading sensor with heading accuracy listed at +/- 3 degrees, plus rate of turn and attitude data available on NMEA 2000.
• NMEA 2000 Micro-C connection (1 port) with a 2 LEN network load.
• IPX7 waterproof rating for open mounting locations exposed to spray and washdowns.
• Flush mount or standard pole mount options for flexible placement.
• Operating temperature range of -25°C to 60°C (-13°F to 140°F) for year-round use.

Installation and setup

Mount it where it has a clean view of the sky and is away from strong magnetic sources like speakers, high-current cabling, or large ferrous structures. A compass-safe distance of 0.5 m (20") is specified, which is a helpful baseline when planning the layout on a smaller helm.

Network connection is straight NMEA 2000: add the included T-connector to the backbone, connect the drop, and make sure the backbone is powered and terminated correctly. Keep the NMEA 2000 drop length within 4.55 m (15 ft).

The heading sensor needs calibration on the water so it can account for magnetic influences on your vessel. Plan on making two smooth 360-degree turns, then continuing into an additional turn and a quarter within about 2 to 5 minutes for the calibration routine to complete.

Compatibility and system integration

The GS25 shares position, COG/SOG, and heading data over NMEA 2000, so it can feed multiple displays and devices on the network at the same time. It connects to Simrad NS Series multifunction displays and also works as a general NMEA 2000 GPS and heading source for compatible equipment.

If your setup uses MARPA target tracking or autopilot steering that calls for a rate-stabilized heading sensor, plan on a dedicated rate compass for those functions and use the GS25 primarily for GPS and magnetic heading related tasks like chart stabilization and radar overlay alignment.

What’s included

• GS25 GPS antenna with heading sensor
• NMEA 2000 network T-connector
• 15 ft (4.5 m) NMEA 2000 network extension cable
• Pole mount kit (GS25/ZG100/POINT-1 style)