hey guys, I've been really busy and will probably still be until AP exams are over, so sorry!! I will get around to this ASAP
airman: NMEA is a standard format in which GPS strings are output. This way when you parse string outputs from a receiver you know exactly which character(s) will give you exactly what information you need (altitude, heading, lat/long, etc).
I haven't actually used NMEA before, since the parallax gps receiver has a "smart mode"where you simply request specific information with predefined functions, so my tutorial will focus more on the navigational math part when I finally make it.
edit: don't have time to find a really good website, but try googling "NMEA strings", "NMEA string parsing", or something like that, you might get more results