Garmin GPS 150 Maintenance Manual

The Garmin GPS 150 is a rugged, panel-mounted aviation GPS receiver designed for VFR navigation. It provides reliable position information, waypoint navigation, and flight planning capabilities. This manual covers essential maintenance procedures, troubleshooting, specifications, and regulatory compliance to ensure optimal performance and safety. Below are key sections for overview, installation, operation, maintenance, and troubleshooting.

Overview and Features

Key components: GPS receiver unit, antenna, power/data cable, mounting bracket. Designed for general aviation use with intuitive interface and reliable satellite tracking.

Installation and Mounting

Proper installation is critical for optimal performance and safety.

1. Select mounting location: Choose a panel location with clear view and accessibility.
2. Prepare cutout: Create 3-inch diameter hole per template provided.
3. Connect antenna: Route antenna cable to optimal location with clear sky view.
4. Connect power: Wire to aircraft bus (10-32 VDC) with appropriate fuse (2A recommended).
5. Secure unit: Install mounting bracket and secure unit with provided hardware.
6. Connect data: Optional RS-232 connection to compatible devices.

WARNING! Installation should be performed by qualified aviation maintenance personnel. Ensure all connections are secure and properly insulated.

Initial Setup and Configuration

After installation, configure unit for first use.

1. Power on: Apply aircraft power; unit will begin satellite acquisition.
2. Initialization: Enter approximate position if prompted (lat/long or nearest airport).
3. Configure settings: Set units (nm/km), time format, magnetic variation.
4. Database verification: Verify database currency and expiration date.
5. Test functions: Verify waypoint entry, navigation displays, and data output.

CAUTION! Do not rely on GPS for primary navigation until proper satellite lock and position verification is complete.

Technical Specifications

• Dimensions: 3.125" diameter, 4.5" depth behind panel.
• Weight: 1.2 lbs (0.54 kg) with bracket.
• Power: 10-32 VDC, 1.5A max, 0.5A typical.
• Display: 2.7" diagonal LCD, 240 x 128 pixels, electroluminescent backlight.
• GPS Performance: Position accuracy: 15 meters RMS, Velocity accuracy: 0.1 knot RMS.
• Update Rate: 1 second position updates.
• Interface: RS-232 (NMEA 0183, GARMIN proprietary).
• Operating Temperature: -15°C to +70°C (5°F to 158°F).
• Storage Temperature: -40°C to +85°C (-40°F to 185°F).
• Certification: TSO-C129a, Class A1.

Controls and Interface

Front panel controls: concentric knobs for cursor control and data entry, dedicated function keys.

Primary Controls: POWER, ENT (enter), CLR (clear), NAV (navigation mode), WPT (waypoint), FPL (flight plan), NRST (nearest), D-> (direct-to).

Display Pages: Map, Navigation, Waypoint Information, Nearest Facilities, Setup Menu. Navigation Data: Ground speed, track, desired track, course deviation, time to waypoint, distance to waypoint. Setup Options: Units, time, display contrast, backlight brightness, system configuration, interface settings.

Navigation and Waypoint Management

Creating and managing waypoints and flight plans.

1. Create waypoint: Press WPT, select "New", enter coordinates or select from database.
2. Edit waypoint: Select existing waypoint, modify as needed.
3. Create flight plan: Press FPL, add waypoints in desired sequence.
4. Activate navigation: Select waypoint or flight plan, press D-> or NAV to activate.
5. Modify in flight: Insert, delete, or reverse flight plan waypoints.

Tip: Regularly backup user waypoints before performing software updates or maintenance.

Routine Maintenance Procedures

Scheduled maintenance ensures continued reliability.

1. Monthly: Clean display with soft, lint-free cloth; check connections for corrosion.
2. Quarterly: Verify antenna connection integrity; check mounting hardware torque.
3. Annual: Perform comprehensive operational check; verify database currency.
4. As needed: Update software via data cartridge or serial connection.

WARNING! Disconnect power before performing any maintenance. Use only approved cleaning solutions.

Software and Database Updates

Keeping software and databases current.

1. Check versions: From setup menu, view software and database versions.
2. Obtain updates: Download from Garmin website or purchase update data cards.
3. Install updates: Follow specific instructions for update method (serial or data card).
4. Verify installation: Confirm new versions are active and functional.

Note: Database updates typically required every 28 days for current aviation data.

Regulatory and Compliance Information

FCC Compliance: Part 15 Class B device. Aviation Certification: TSO-C129a, Class A1. Warranty: 1-year limited warranty from date of purchase. Copyright © Garmin Ltd. or its subsidiaries. For technical support, contact Garmin Aviation Product Support at 1-800-800-1020 or visit www.garmin.com/aviation.

Troubleshooting Guide

Reset Procedures: Soft reset: Power cycle unit. Hard reset: Consult maintenance manual for factory reset procedure (erases user data).

Service: For repairs, contact Garmin Authorized Service Center. Do not attempt internal repairs.