A method for determining the spatial alignment of an inertial measurement unit, IMU, detachably mounted to a vehicle comprising: identifying a first vehicle-based direction based, at least, on one or more correlation operations that relate to first vehicle-related movement data and at least one of a first acceleration or a second acceleration, said first acceleration and said second acceleration corresponding to one or more accelerations measured using the IMU, wherein said first vehicle-based direction comprises a forward-backward direction, and said first vehicle-related movement data comprises acceleration data that is derived from data provided by a satellite positioning system; wherein said identifying a first vehicle-based direction comprises ascertaining at least one first correlative indication between and/or among said acceleration data that is derived from data provided by a satellite positioning system and said first acceleration; ascertaining at least one second correlative indication between and/or among said acceleration data that is derived from data provided by said satellite positioning system and said second acceleration; and selecting a direction that is associated with said first acceleration or said second acceleration as said first vehicle-based direction based on said at least one first correlative indication and/or said at least one second correlative indication; and the method further comprising associating said first vehicle-based direction with a first direction comprising a course-over-ground direction that is transformable to an earth-based coordinate frame; and determining a spatial alignment of the IMU with respect to the earth-based coordinate frame based at least on said first direction. identifying a first vehicle-based direction based, at least, on one or more correlation operations that relate to first vehicle-related movement data and at least one of a first acceleration or a second acceleration, said first acceleration and said second acceleration corresponding to one or more accelerations measured using the IMU, wherein said first vehicle-based direction comprises a forward-backward direction, and said first vehicle-related movement data comprises acceleration data that is derived from data provided by a satellite positioning system; wherein said identifying a first vehicle-based direction comprises ascertaining at least one first correlative indication between and/or among said acceleration data that is derived from data provided by a satellite positioning system and said first acceleration; ascertaining at least one second correlative indication between and/or among said acceleration data that is derived from data provided by said satellite positioning system and said second acceleration; and selecting a direction that is associated with said first acceleration or said second acceleration as said first vehicle-based direction based on said at least one first correlative indication and/or said at least one second correlative indication; and the method further comprising associating said first vehicle-based direction with a first direction comprising a course-over-ground direction that is transformable to an earth-based coordinate frame; and determining a spatial alignment of the IMU with respect to the earth-based coordinate frame based at least on said first direction.