Garmin GPS 90 Manual

The Garmin GPS 90 is a portable handheld GPS receiver designed for outdoor navigation, featuring a 12-parallel channel GPS receiver, built-in worldwide basemap, waypoint and route storage, track log recording, and NMEA 0183 output for interfacing with other devices. It operates on AA batteries and includes a backlit display for low-light conditions. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

Key components: GPS receiver with antenna, LCD display with backlight, control buttons, serial data port, and external power jack.

Feature	Description
GPS Receiver	12-parallel channel for fast satellite acquisition
Display	High-contrast LCD with backlight for night use
Waypoints	Store up to 500 user-defined locations
Routes	Create and store up to 20 reversible routes
Track Log	Record up to 1024 track points
NMEA 0183 Output	Interface with autopilots or chartplotters
Power	4 AA batteries or external 12V DC input
Water Resistance	Designed to withstand splashes and rain
Backlight	Adjustable for low-light conditions
Data Port	Serial connection for PC interface

Installation

Unpack and inspect contents. Install batteries and prepare for initial use.

1. Install batteries: Open battery compartment, insert 4 AA batteries observing polarity.
2. External antenna (optional): Connect to external antenna port if required for better reception.
3. Mounting: Use optional mounting bracket for fixed installation in vehicle or boat.
4. Power on: Press and hold POWER button to start unit.

WARNING! Do not expose to extreme temperatures. Ensure batteries are installed correctly to avoid damage.

First-Time Setup

Power on GPS; follow initialization procedure.

1. Initialization: Allow unit to acquire satellite signals (may take several minutes first time).
2. Set language: In SETUP menu, select ENGLISH (default).
3. Set units: Choose metric or statute units for distance and speed.
4. Set time: Configure time zone and format (12/24 hour).
5. Calibrate compass (if applicable): Follow on-screen instructions.

CAUTION! Ensure clear view of sky for best GPS signal acquisition.

Specifications

• GPS Channels: 12 parallel channels.
• Update Rate: 1 second continuous.
• Accuracy: Position: 15 meters RMS, Velocity: 0.1 knot RMS.
• Dynamics: Supports speeds up to 999 knots, altitudes to 18,000 meters.
• Waypoints: 500 with name and symbol.
• Routes: 20 reversible routes with up to 30 waypoints each.
• Track Log: 1024 points with automatic or manual recording.
• Interface: NMEA 0183 version 2.0, GARMIN proprietary.
• Power: 4 AA batteries (approx. 12 hours), 12V DC external input.
• Display: 5.6 x 3.8 cm LCD, 120 x 160 pixels, 4-level grayscale.
• Operating Temp: -15°C to 70°C.
• Waterproof: IEC 529 IPX7 standard.

Controls and Settings

Access menus via PAGE and ENTER buttons. Front Panel: POWER, PAGE, ENTER, QUIT, ROCKER keypad.

Button Functions: POWER (on/off), PAGE (cycle through display pages), ENTER (select/confirm), QUIT (exit/cancel), ROCKER (move cursor/menu navigation).

Setup Menu: Units (statute/metric), Time (format/zone), System (interface, backlight), Navigation (route preferences). Display Pages: Satellite Status, Map, Navigation, Highway, Main Menu.

Connecting Devices

Data Cable: Connect to PC for waypoint/route transfer. NMEA: Connect to autopilot or chartplotter.

1. Turn off GPS before connecting cables.
2. Use supplied data cable for PC connection (serial port).
3. For NMEA output, connect to appropriate device using recommended cable.
4. Configure interface settings in SETUP menu (baud rate, protocol).

Tip: Use waterproof connectors for marine installations.

Navigation Functions

Basic navigation using waypoints and routes.

1. Mark waypoint: Press and hold ENTER at current location, edit name/symbol.
2. Go to waypoint: Select from waypoint list, choose "Go To" for direct navigation.
3. Create route: From Main Menu, select Routes, add waypoints in sequence.
4. Follow route: Activate route for turn-by-turn navigation.
5. Track navigation: Use track log to retrace path or navigate to track points.
6. Man overboard: Press and hold QUIT to mark MOB position and navigate back.

WARNING! GPS accuracy can be affected by environmental conditions. Always have backup navigation methods.

Advanced Features

Sun/Moon Information: View sunrise/sunset and moon phase data. Proximity Waypoints: Set alarm for approaching waypoints. Simulator Mode: Practice navigation without satellite signal.

Care & Maintenance

Clean with damp cloth only. Store in dry place when not in use. Replace batteries regularly if not used for extended periods.

CAUTION! Do not use chemicals or abrasives. Keep connectors clean and dry.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits. This device complies with part 15 of the FCC Rules. Copyright © Garmin Ltd. or its subsidiaries. For support, visit www.garmin.com or contact Garmin Product Support.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	Dead batteries	Replace with fresh AA batteries; check polarity.
Poor satellite reception	Obstructed view	Move to open area; ensure clear view of sky.
Inaccurate position	Multipath interference	Move away from buildings/obstructions; allow time for signal stabilization.
Display difficult to read	Backlight off/contrast	Adjust backlight and contrast in setup menu.
Waypoints not saving	Memory full	Delete unused waypoints to free memory.
No data output	Cable/interface settings	Check cable connections; verify interface settings match connected device.

Reset: Remove batteries for 30 seconds to perform soft reset.

Service: Contact Garmin Product Support; www.garmin.com