Garmin GPS 48 Manuale

The Garmin GPS 48 is a rugged, waterproof handheld GPS receiver designed for marine, aviation, and outdoor use. It features a high-sensitivity GPS receiver, NMEA 0183 interface for connecting to autopilots and chartplotters, built-in celestial database for sun/moon information, waypoint and route storage, track log recording, and user-friendly interface. Powered by AA batteries or external DC source. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

Key components: Waterproof case, LCD display, control buttons, external antenna port, data/power connector, battery compartment.

Feature	Description
GPS Receiver	High-sensitivity, 12 parallel channel
Waterproof Rating	IPX7 (submersible to 1 meter for 30 minutes)
NMEA 0183 Interface	For connection to marine/aviation instruments
Celesital Database	Sunrise/sunset, moon phase information
Waypoint Storage	Up to 500 user waypoints
Route Storage	Up to 20 reversible routes with 30 legs each
Track Log	Automatic track recording with 10 saved tracks
Display	4-level grayscale LCD, backlit for night use
Power Source	4 AA batteries or 10-40V DC external
Data Port	For PC connection and firmware updates

Installation

Unpack and inspect contents. Install batteries or connect to power source.

1. Install batteries: Open battery compartment, insert 4 AA batteries observing polarity.
2. External antenna: Connect optional external antenna to antenna port for better reception.
3. NMEA connection: Connect data/power cable to NMEA-compatible devices (autopilot, sounder).
4. Mounting: Use optional mounting bracket for fixed installation.

WARNING! Ensure proper polarity when connecting external power. Use only recommended power sources.

First-Time Setup

Power on unit; follow initialization procedure.

1. Acquire satellites: Place unit with clear view of sky, wait for satellite acquisition (5-15 minutes).
2. Set preferences: Use MENU button to set units (nautical/statute/metric), time format, datum.
3. Calibrate compass: Follow on-screen prompts if using optional electronic compass.
4. Enter position: Manually enter position if needed for faster startup.

CAUTION! Initial satellite acquisition requires clear view of sky. Avoid obstructions.

Specifications

• GPS Channels: 12 parallel channel receiver.
• Update Rate: 1 second continuous.
• Accuracy: Position: <15 meters RMS, Velocity: 0.1 knot RMS.
• Interfaces: NMEA 0183 version 2.0, GARMIN proprietary.
• Waypoints: 500 with name and symbol.
• Routes: 20 reversible routes, 30 legs each.
• Tracks: 10 saved tracks, 750 points each.
• Power: 4 AA batteries (alkaline or NiMH) or 10-40V DC.
• Battery Life: Up to 24 hours (typical use).
• Operating Temp: -15°C to 70°C (5°F to 158°F).
• Waterproof: IPX7 standard.
• Dimensions: 15.5 x 6.1 x 3.3 cm (6.1" x 2.4" x 1.3").
• Weight: 255g (9 oz) with batteries.

Controls and Settings

Access functions via front panel buttons. Front Panel: POWER, PAGE, ENTER, GOTO, MARK, MENU, arrow keys.

Button Functions: POWER: On/Off and backlight control. PAGE: Cycle through display pages. ENTER: Accept selection. GOTO: Begin navigation to waypoint. MARK: Create waypoint at current position. MENU: Access options menu. Arrows: Move cursor and adjust values.

Setup Pages: System (units, time, interface), Navigation (routing method, alarms), Tracks (setup recording), Calibration (compass, altimeter if equipped). Display Pages: Satellite Status, Position, Map, Highway, Navigation Data, Main Menu.

Connecting Devices

NMEA devices: Connect via data/power cable. PC: Connect via serial interface cable.

1. Turn off GPS and device before connecting.
2. Connect data/power cable to GPS and NMEA device (autopilot, sounder, chartplotter).
3. Configure NMEA sentences in interface setup menu.
4. For PC connection: Use serial cable to COM port, set baud rate (4800 default).

Tip: Verify NMEA wiring (TX, RX, ground) matches connected device specifications.

Navigation Functions

Basic navigation to waypoints and along routes.

1. Create waypoint: Press MARK at desired location, edit name/symbol if needed.
2. Navigate to waypoint: Press GOTO, select waypoint from list or enter coordinates.
3. Follow route: Create route in route menu, then activate for navigation.
4. Steering information: Use Highway page or Navigation page for course guidance.
5. Man overboard: Press and hold GOTO for 2 seconds to mark MOB position and begin navigation back.
6. Track navigation: Follow recorded track in reverse direction.

WARNING! GPS is an aid to navigation. Always use with proper charts and situational awareness.

Advanced Features

Celestial Information: Access sun/moon data for any date/location. Proximity Waypoints: Set alarm radius around waypoints. NMEA Output: Configure which sentences are transmitted.

Care & Maintenance

Clean with fresh water after saltwater use. Use mild soap and soft cloth. Ensure battery compartment seal is clean and intact.

CAUTION! Do not use harsh chemicals or high-pressure spray. Ensure unit is dry before charging or connecting cables.

Regulatory Information

FCC Compliance: This device complies with Part 15 of FCC rules. CE Compliance: Meets European directives. Copyright © Garmin Ltd. or its subsidiaries. For support, visit www.garmin.com or contact Garmin customer support.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	Batteries/cable	Check battery polarity; replace batteries; verify external power connection.
No satellite acquisition	Obstruction/location	Move to open area; ensure clear view of sky; wait 15+ minutes.
Inaccurate position	Poor satellite geometry	Wait for better satellite coverage; ensure current almanac.
No NMEA data output	Cable/settings	Check cable connections; verify NMEA sentences enabled in setup.
Display difficult to read	Contrast/backlight	Adjust contrast in setup menu; enable backlight for low light.
Buttons not responding	Moisture/defect	Ensure unit is dry; if problem persists, contact service.

Reset: Remove batteries for 30 seconds to reset unit.

Service: Contact Garmin Customer Support or authorized service center.