GPS Bee, a SKM58 breakout that adds a Xbee compatible footprint for SKM58.     SKM58 Description The SKM58 Series with embedded GPS antenna enables high performance navigation in the most stringent applications and solid fix even in harsh...

Here is a real time clock based on the DS3234 Real Time Clock IC. The DS3234 is a low-cost, extremely accurate SPI bus real-time clock with an integrated temperature-compensated crystal oscillator and crystal. The RTC maintains seconds, minutes, hours,...