I was talking with someone over e-mail today about this project, and they brought up the topic of a development board.

It's something I hadn't considered for this project before now, but it makes some sense, now that I think about it.

For Orthrus, I originally bought an XPLained E70 board, but I didn't actually make any use of it. Its SD card slot lacked the multiplexing hardware required for that firmware. I wound up making my own board, and it worked well enough that no further hardware iteration was strictly necessary.

But for this project, the E70 XPlained might be just the thing. It has the Ethernet interface on it, which is exactly the same as what I propose to use anyway. All I really need to do is use some jumpers to connect one of my GPS breakout boards up and write the firmware. This has the added advantage of allowing me to try different ways to wire the GPS module to get one that's optimal.