. I'm a little unclear about the process for connecting one to it, though, or whether that's actually possible, with the MKR1400. Any pointers you have here would be appreciated as it is such a neat little board, it would be great to be able to connect a GPS with minimum effort.
Unfortunately the I2C pins for the GPS connection are under the u-blox U201 module so this is not a possible for the average hobbyist to do. We'd recommend you get an external GPS module which can operate at 3.3V and connect it to the SAMD processor on board via the I2C or UART breakout pins.