Simrad HS75 - User Manual

Questions and Answers

C
Charles WalkerAug 4, 2025
Why does my Simrad HS75 Compass show no heading or an incorrect heading value?
- J
  jennifer76Aug 4, 2025
  If your Simrad Compass shows no heading or an incorrect heading value, first monitor the number of satellites and SNR values for both antennas in the Simrad display unit, ensuring that at least four satellites have a strong SNR value in both antennas. Also, confirm that the arrow on the underside of the HS75 is directed to the bow, as the heading is determined from the primary GNSS antenna to the secondary GNSS antenna.
J
John RodriguezAug 10, 2025
What to do if Simrad Compass receiver fails to power on?
- P
  Patricia StoneAug 10, 2025
  If your Simrad Compass receiver fails to power on, verify that the NMEA 2000 backbone is powered. Check the voltage coming out of the connector at the end of the cable and ensure that the power source meets the minimum available current requirement of > 1.0 A.
B
Brian RichardsonAug 15, 2025
How to fix Simrad HS75 when it has no GNSS lock?
- K
  Krystal MathisAug 15, 2025
  If your Simrad Compass is not getting a GNSS lock, verify that the HS75 has a clear view of the sky.
J
Joshua DunnAug 21, 2025
What to do if Simrad Compass has no data from the HS75?
- E
  Erin VelasquezAug 22, 2025
  If your Simrad Compass is not receiving data from the HS75, verify that the NMEA 2000 backbone is powered and check the integrity and connectivity of cable connections.
S
Sandra MillerAug 27, 2025
Why does my Simrad HS75 have no SBAS lock?
- W
  Walter HallAug 27, 2025
  An SBAS lock is only possible if you are in an appropriate SBAS region and the HS75 has a clear view of the sky. Also, be aware of the limited SBAS availability in the southern hemisphere.

Summary

Preface

Disclaimer

Navico's right to change products, owner's responsibility for installation/use, liability disclaimer.

Governing Language

English version is official in case of translation conflicts.

Compliance Statements

Declarations of conformity and certificates available at www.navico-commercial.com.

Copyright

Warranty

Warranty card supplied separately; refer to website for queries.

Trademarks

Lists registered trademarks like Navico, Simrad, and NMEA.

Important Text Conventions

Explains emphasis used for Notes and Warnings in the manual.

Introduction

Overview

HS75 GNSS Compass features, satellite support, accuracy, and components.

Parts

Lists required parts for HS75 installation.

Installation

Wiring Guidelines

Recommendations for routing NMEA 2000 cable to avoid damage and interference.

Mounting Location

Guidance on choosing a location with clear sky view and avoiding obstructions.

VHF Interference

Discusses potential interference from VHF sources and minimum spacing.

Mounting Orientation

How to mount the HS75 parallel to the boat's centerline for true heading.

Alignment

Using sight design features for enclosure alignment with the vessel.

Mounting Options

Details four mounting options: surface mounting (with/without adapter) and pole mounting.

Surface Mounting Without Adapter

Step-by-step guide for surface mounting without an adapter.

Surface Mounting With Adapter

Step-by-step guide for surface mounting using an adapter.

Pole Mounting

Step-by-step guide for mounting the HS75 on a pole.

Wiring Details

Explains the NMEA 2000 Micro-C connector pinout and function.

Electrical Isolation

Explains power supply isolation and enclosure's role in preventing electrolysis.

Dimensional Drawings

Troubleshooting

Receiver Fails to Power

Troubleshooting steps when the unit does not power on.

No Data from HS75

Troubleshooting steps for loss of data transmission from the unit.

No GNSS Lock

Troubleshooting steps when the unit cannot acquire GNSS signals.

No SBAS Lock

Troubleshooting steps for issues with SBAS signal acquisition.

Heading Issues

Troubleshooting steps for heading acquisition or accuracy problems.

Supported Data

NMEA 2000 Received Messages

Details PGNs received by the HS75 upon request.

NMEA 2000 Transmitted Messages

Details PGNs transmitted by the HS75, including system time and heading.

Technical Specifications

Sensor and Positioning Accuracy

Specifies receiver type, signals received, channels, and accuracy metrics.

Update Rate

Details the data update rates for position and heading information.

Communication

Specifies connector type and power requirements for the unit.

Mechanical

Provides weight and dimensions of the HS75 unit.

Aiding Devices

Describes the function of the six-axis rate sensor and tilt sensor.

Environmental

Lists operating temperature, humidity, enclosure rating, and EMC compliance.

Simrad HS75 Specifications

General

Weight	0.5 kg
Heading Accuracy	±1°
Supply Voltage	10-32 VDC
Update Rate	10 Hz
Battery Life	N/A (externally powered)
Roll and Pitch Accuracy	1°
Operating Temperature	-15°C to +55°C
Interfaces	NMEA 0183
Display	N/A (sensor only)

Related product manuals