The Adafruit Ultimate GPS HAT adds high-quality GPS and GLONASS positioning to your Raspberry Pi. Built around a PA1616D module, it provides precise location data and a built-in real-time clock (RTC) with coin cell backup — perfect for outdoor projects, time synchronisation, and location-aware applications.

This mini kit includes the fully assembled GPS HAT and a 2×20 GPIO header for soldering. It connects via the Raspberry Pi's hardware UART and features a u.FL connector for an optional external active antenna, a prototyping area for adding your own components, and breakouts for all remaining Pi GPIO pins.

Key Features

• GPS + GLONASS Support – Dual constellation tracking for improved coverage and faster fixes
• 99-Channel Receiver – -165 dBm sensitivity with up to 10 Hz position updates
• Built-in RTC – Real-time clock with CR1220 coin cell backup for 7+ years of timekeeping, even when the Pi is off
• PPS Output – Pulse-Per-Second signal connected to GPIO pin #4 by default
• Dual Antenna Support – Internal patch antenna for outdoor use, plus u.FL connector for external active antenna (auto-switching)
• Fix Status LED – Visual indicator blinks when GPS coordinates are acquired
• Prototyping Area – Space on the board for adding LEDs, sensors, and other components
• GPIO Breakouts – Access to all spare Raspberry Pi GPIO pins

Ideal For

• Raspberry Pi GPS tracking and navigation projects
• Accurate timekeeping and NTP server setups
• Outdoor data logging with location stamps
• Mobile robotics and autonomous vehicle prototyping

Compatibility

• Raspberry Pi Model A+, B+, Pi 2, Pi 3, Pi 4, and Pi Zero

Package Contents

• 1× Adafruit Ultimate GPS HAT (fully assembled with GPS module and coin cell holder)
• 1× 2×20 GPIO female header (requires soldering)

Resources

• Adafruit Ultimate GPS HAT Tutorial – Setup guide, wiring, and usage instructions
• PA1616D Module Datasheet (PDF)