I want to prototype a data logging system for a long-term project. Specifically I need to log GPS coordinates and other sensor info.
I have the Lassen IQ GPS reciever and the OpenLog serial data logger is on its way. Could I directly connect the NMEA output of the Lassen IQ to the input of the OpenLog?
Just clarifying before circuits start frying 
Looks good.
page 24 says 3.3V TTL for GPS
http://www.sparkfun.com/datasheets/GPS/ … Manual.pdf
3.3V for the data logger.
[https://github.com/nseidle/OpenLog/wiki/Datasheet](https://github.com/nseidle/OpenLog/wiki/Datasheet)Input voltage on RXI pin must not exceed 6V. Output voltage on TXO pin will not be greater than 3.3V.
Depending on your refresh rate and NMEA sentences used, that data could really pile up. You may want to parse the GPS output and only keep the Lat Long.