• Develop interesting projects for the Arduino using GPS technology• Develop coding based applications for advanced projects• Highly sensitive receiver & wide channel give reliable GPS reception•-165 d Bm sensitivity, 10 Hz updates, 66 channels•5V friendly design & only 20m A current draw• Breadboard friendly + two mounting holes•RTC battery-compatible• Built-in datalogging•PPS output on fix•>25 Km altitude• Internal patch antenna + u.FL connector for external active antenna• Fix status LEDThe breakout is built around the MTK3339 chipset, a no-nonsense, high-quality GPS module that can track up to 22 satellites on 66 channels, has an excellent high-sensitivity receiver (-165 d B tracking!), & a built in antenna. It can do up to 10 location updates a second for high speed, high sensitivity logging or tracking. Power usage is incredibly low, only 20 m A during navigation. Best of all, we added all the extra goodies you could ever want: a ultra-low dropout 3.3V regulator so you can power it with 3.3-5VDC in, 5V level safe inputs, ENABLE pin so you can turn off the module using any microcontroller pin or switch, a footprint for optional CR1220 coin cell to keep the RTC running & allow warm starts & a tiny bright red LED. The LED blinks at about 1 Hz while it's searching for satellites & blinks once every 15 seconds when a fix is found to conserve power. If you want to have an LED on all the time, we also provide the FIX signal out on a pin so you can put an external LED on. Two features that really stand out about version 3 MTK3339-based module is the external antenna functionality & the the built in data-logging capability. The module has a standard ceramic patch antenna that gives it -165 d B sensitivity, but when you want to have a bigger antenna, you can snap on any 3V active GPS antenna via the u FL connector. The module will automatically detect the active antenna & switch over! Most GPS antennas use SMA connectors so you may want to pick up one of our u FL to SMA adapters. The other cool feature of the new MTK3339-based module (which we have tested with great success) is the built in datalogging ability. Since there is a microcontroller inside the module, with some empty FLASH memory, the newest firmware now allows sending commands to do internal logging to that FLASH. The only thing is that you do need to have a microcontroller send the " Start Logging" comm&. However, after that message is sent, the microcontroller can go to sleep & does not need to wake up to talk to the GPS anymore to reduce power consumption. The time, date, longitude, latitude, & height is logged every 15 seconds & only when there is a fix. The internal FLASH can store about 16 hours of data, it will automatically append data so you don't have to worry about accidentally losing data if power is lost. It is not possible to change what is logged & how often, as its hardcoded into the module but we found that this arrangement covers many of the most common GPS datalogging requirements. We've tested this version of the Ultimate GPS in a high-altitude balloon, & it kept fix up to 27km! A full tutorial is also available, which has tons of information about the module, how to use the data logger & more