Review on Gowoops GPS Module with Active Antenna: Perfect for Arduino STM32 51 Single Chip Microcomputer by Jay Elmo

Great option for a small full featured GPS receiver. I am using this GPS receiver for a sync application. u-blox neo-6 has some very useful features for synchronizing with UTC. In addition to the "external" antenna, this device has two features that are particularly useful for my application. It has a small built-in battery that keeps the GPS almanac going (at least) all day long. When driving a 3.3.v device I can connect both serial and 1pps signals directly to the inputs of my Arduino WITHOUT level switches (very handy).