## GPS Module GY-NEO6MV2
The NEO6MV2 is a compact GPS module based on the NEO-6M chipset, widely used in DIY electronics projects. It features a built-in ceramic antenna, UART interface, and support for NMEA protocol.
**Key Specifications:**
- Operating Voltage: 3.3V to 5V DC.
- Baud Rate: Default 9600 bps (configurable).
- Position Accuracy: 2.5 meters (horizontal).
- Time-to-First-Fix (TTFF): Cold start ~27 seconds; Hot start ~1 second.
- Update Rate: Up to 10 Hz.
- Interfaces: UART (TX/RX), I2C (optional).
- Backup Battery: CR1220 (included) for retaining ephemeris data during power loss.
- LED Indicator: Blinks at 1 Hz when satellites are locked; off otherwise.
- Dimensions: Approximately 25mm x 35mm.
The module stores configuration (e.g., baud rate) and almanac data in internal EEPROM, which retains data even without power. The backup battery enables "hot starts" by preserving clock and satellite data, reducing TTFF from minutes to seconds.
> **Usage Tips:**
>For first-time use, perform a cold start in an open area with clear sky view; it may take 5-30 minutes to download almanac data.
> Cloud cover or indoor environments can degrade performance; use an external antenna for better signal strength.
>Common Issues: If no signal, check wiring, baud rate, or battery status.
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