"I've never used the app, so I can't help. Did you try the app on the computer and get it working there?"

"Is the Yuan 10 set to output without receiving commands? Many RTK GPS need to be told what to do upon start up. I would try connecting to a computer first, to see if there is any valid data on the serial port. Use a terminal program like teraterm or…"

"That one looks to be L1 only. It is much much better using L1+L2 because the ambiguities are so much easier to resolve"

"Antonie, having a unit with a battery and in an enclosure that is durable is worth a lot!"

"PA300 has rtk as an option. It seems all of these more expensive boards have everything as an option. on top of the base price ($1658.00 which only includes L1L2,  1Hz, raw data):
GLONASS                            $1125
RTK Base & Rover          …"

"There are a few L1/L2 boards out there now in the 1k-2k range now. I recently checked on the the PA300 miniEclipse Smart Antenna GNSS Module ans was priced at $1658.00 (L1L2,  1Hz, raw data). (has antenna built in)
A year or two ago the P200…"

"I was able to hack the protocol on an opti logic 400LH.
It spits out serial data on one of the internal pins...
more details here:
http://dangerousprototypes.com/forum/viewtopic.php?f=56&t=5880"