I want to order an IMU like this : https://www.raspberrypi.org/blog/real-time-orientation-display-with-the-minimu-9-v2/, and mount it on the mainboard so that fits mecahnically and is stable. I found a way using AdaFruit GPS ( https://www.adafruit.com/product/2324 ) and sticking the IMU inside the holes and connecting them to the various pins ( Vdd, SDA , SCL etc. ) However I do not want any GPS.
Is there any other solution? What is HAT by the way in Adafruit?
EDIT, after some downvotes ( misunderstanding maybe ) for my answer: Is there any solution, wherein there is any alternative to Pololu and which fits mechanically on the Raspberry Pi.