This is the latest version of our Venus GPS board; the smallest, most powerful, and most versatile GPS receiver we carry. It's based on the Venus638FLPx, the successor to the Venus634LPx. The Venus638FLPx outputs standard NMEA-0183 or SkyTraq Binary sentences at a default rate of 9600bps (adjustable to 115200bps), with update rates up to 20Hz! The Venus638FLPx also allows for limited on-chip logging (check out the firmware below), as well as external logging using a SPI flash memory chip (not included). Project description, more information and ordering can be found at https://www.sparkfun.com/products/11058 Venus638FLPx Datasheet: http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Sensors/GPS/Venus/638/doc/Venus638FLPx_DS_v07.pdf Binary Command Set: http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Sensors/GPS/Venus/638/doc/AN0003_v1.4.19.pdf Logging application note: http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Sensors/GPS/Venus/638/doc/AN0008_v1.4.11-datalogging.pdf GPS Viewer / Configuration Software: http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Sensors/GPS/Venus/638/viewer/GPS Viewer - Customer Release_110613.zip Stock firmware - standard version: http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Sensors/GPS/Venus/638/firmware/STI_01.06.04-01.10.24_npse_PND_AGPS_WAAS_LOG_9600_20111021.zip Stock firmware - "high dynamic range" version: http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Sensors/GPS/Venus/638/firmware/STI_01.06.04-01.10.24_npse_HiDyn_AGPS_WAAS_LOG_9600_20111021.zip Stock firmware- Internal Logging version: http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Sensors/GPS/Venus/638/firmware/STI_01.06.02-01.04.23_npse_log_internal_9600_20111107.zip Product Video: http://youtu.be/dIqc2xIpoVs?t=3m23s Tutorial: http://www.doctormonk.com/2012/05/sparkfun-venus-gps-and-arduino.html