Recommended · for beginners
U-blox neo-6m GPS Module: Arduino NMEA Decoding
Why people recommend it
Given as a tutorial for getting a serial GPS module running by itself, with one answer using it to explain the default NMEA output.
Watch for: Useful as a first test before combining modules
In their words
By default, it is configured for NMEA protocol (refer this video).
Anurag Vasanwala on raspberrypi.stackexchange.com, Feb 2016. CC BY-SA.