The following modules are known to work with the kit. The table gives a source if known, and the appropriate "GPS Baud" setting to use in the kit, to suit the GPS module's default output configuration with the kit.
Please note that some inexpensive GPS modules such as the VK16E using the Sirf III chipset, have a somewhat inaccurate 1pps signal. A method to cope with this has been devised and released in firmware version v3.01. Using the new method, the calibration accuracy is very good. You can read more details here.
| Model | Antenna | Source | "GPS Baud" | Comments |
| SKM61 | Built-in | AVAILABLE FROM QRP Labs! | 009,600 | Uses 5V supply. Requires two 4.7K pullup resistors. Extremely good sensitivity and highly accurate (10ns) timing pulse. |
| SKM52 | Built-in | Data here, used to be available from QRP Labs | 009,600 | Requires 3.3V supply, and 10K pullup resistors. Very good sensitivity and highly accurate (10ns) timing pulse. |
| VK16E | Built-in | Data here, used to be available from QRP Labs | 009,600 | See HP calibration comments. |
| Trimble Silvana ACM | Built-in | dpieshop | 009,600 | Uses Trimble Condor C1919A GPS module; requires 3.3V regulated supply. Works only with v2.03 and above. |
| MTK3339 | Built-in | Adafruit | 009,600 | |
| Reyax UP501 | Built-in | eBay, GBP 17 | 009,600 | Requires 3.3V supply. Note different "GPS Baud" setting. Do NOT use pull-up resistors! |
| EM-406A | Built-in | Sparkfun or Expansys or Proto-pic | 004,800 | Works with firmware v2.03 and above. May need to use 10K pull-up resistors from 1pps and Serial signal to +5V |