Using it with an Arduino Uno R3, and NeoGPS, so I can parse out both GPS and Glonass satellites. System works very well.

We built a small beacon for our high altitude balloon flights using this unit, a PIC chip, and an XBee. The system works great below about 40,000 feet. I specifically purchased this unit because the datasheet says it works to 50,000m. Seems that it might be able to do that, but you have to reprogram the GP-735. The problem is that there is almost zero information about how to do that. We have tracked down a possible solution that we will try. If you are not going to high altitude, then this is a great product. By the way, it will run on much lower voltage than they claim. We have been able to drain our batteries all the way down to 2.5V and still get good performance.

This was my first time playing with a GPS on a Raspberry Pi and the GP-735 made it very simple. Just connect power and a serial port (it runs on 3.3v so just direct connect it to the RPi directly) and you'll immediately start receiving NMEA "sentences". (A simple "cat /dev/tty0" or similar for your setup will output it to your display).

I was in my "maker space" about 4' from a basement window and this still managed to lock on to the GPS satellites so it seems pretty robust even with a built-in antenna. It's very small and can really fit anywhere.

It does not come with the cable that plugs into the end so be sure to order that separately...I ordered two just in case.

The receiver works great when connected to my PC via the mini-shield/Pro-Mini and a FTDI board. Connects and locks on 6+ satellites within 30 - 40 seconds, even indoors!. But (why is there always a 'but'?) on battery power, outdoors, it takes 2 minutes or more to lock and drops out regularly. The battery is a 2500mA, 5V lithium cell phone charger plugged into the FTDI USB port. Does anyone know what tricks are requires for battery operation?

Yet to test its functionality but I realized this does NOT come with the JST SH Jumper 6 Wire - 1.75" cable which retail for another $2.95. I did not read carefully and simply expected a $40 dollar GPS module would come with the GPS or the weather shield. I can't ask for free cables but why not just put it in the package and adjust the price accordingly?

The GPS itself is good - the module, not so much. Unusual cable adapter and they don't include the cable! Also, in a fit of unrelated frustration I switched the polarity (I know, I know) and instantly fried the device. So obviously there is zero protection built in.

I bought this to use as a simple GPS receiver for an Arduino project. It works great for that. Just remember to buy the recommended cable. Also pay attention to the pinout diagram in the data sheet. The black wire on the JST cable is NOT pin 1, it is pin 6. That took me a while to figure out, but once I read the manual this started feeding data to the Arduino without issue. It is not the fastest GPS module I have used, taking a while to get a fix and only 1hz updates, but the signal is solid and even sitting at the window indoors, it is getting 7 sats.

Ordered the cable and the unit. Used my MB500 to power it up and capture and decode the serial output. Copied the lat/long values, converted them to fractional degrees, and entered them into Google maps. Once it found enough satellites and switched to mode 2 it was accurate within a meter or two - dropped the marker right on top of me. Very nice unit.

This is an impressive piece of kit in a small form factor. Coupled with the Sparkfun libraries it works very well as intended.

Library example uses SoftwareSerial interface to GPS but this has conflicts with SD/SPI libraries if you want to do logging using an Uno R3 and SD card with SPI interface (good to be aware).

Switched to I2C enabled SD card using Openlog and should be fine.

Only complaint is that the chart in the data sheet listing the pin out numbers the pins opposite the standard pin numbering on the JST-SH connector. Other than that the compact size is great, easy to use no complaints.

Started the prototype using an Arduino Mega along with softwareserial and tinygps++ libraries and it worked great. Eventually ported it over to the esp8266 IoT platform running Blynk and I never had a problem with it. I will say that you shouldn't rely on GPS (any type) altitude as it was sort of in the ballpark, but changed very frequently presumably due to the acquisition (or loss) of additional satellites. I did not have any trouble receiving over 5 satellites indoors which was very convenient.

Works as advertised.

Works perfectly fine with an unlicensed ISM tracker. Ditched the onboard GPS and added this unit to it by soldering the signal cable to the board and used the 3.3V power output on an earlier version of the device http://www.eggtimerrocketry.com/page45.php

This receiver presents a great value. It's lower cost that most others yet it works just as well as other units. It's in a tiny format so it easily fits into small enclosures, quickly picks up satellites and maintains those signals when its moved around.

I used a jst cable and breakout board to connect it to my Arduino project. The TinyGPS library made accessing the data in a usable format a snap.

But has a couple of imitations the larger ones don't have. It takes about 30 seconds for the lock to occur after power up. Once locked, the module can be put into power-down mode and come back up very quickly. Maybe it remembers its previous position and can re-lock quicker? I could not write to the module at all. I don't think that feature is supported. I used it as a real time clock with a PIC micro to control my landscape lighting and it worked well in that application compensating for DST, etc.

I got this one because I needed a GPS slimmer than the standard one with a 1"x1" ceramic antenna. There are 2 issues: the claim is 20-30 seconds cold start. Maybe under perfect conditions, but definitely not sitting right next to a window. And doesn't work 5 feet from the window inside a standard house. Another GPS module (ubox) had no problem even with a cold start in the same spot. Also while working with a battery at 4 volts, stopped working when the battery discharged to 3.6 V.