Alpine iLX-F309 Owners Manual English - Page 77

Distance guidance marks The marks represent the distance from the rear of the car (from the rear end of the bumper). • The marks do not move in synchronization with the steering wheel. • We recommend that you measure the actual distance to the marks when parked on a level surface. • Depending on the condition of the car or road surface, the range of vision may vary. • The camera has a limited range of vision. Objects at extreme angles to the camera (e.g. under the bumper or at opposite ends of the bumper) may not be in the its field-of-vision. • The rear camera image may have a tint which is different from the actual surroundings. • Depending on the car, the guidance may deviate to the right or left. This is not a malfunction. Distance guidance mark The distance guides represent the ground level distance from the rear bumper. It is difficult to accurately estimate the distance to objects above ground level. In the following example, the distance to A is 0.5 m and the distance to B is 1 m. C B A (about 0.5 m) about 1 m When there is a steep upward slope behind the car (example) Distance guidance marks Actual distances Error Error The distance guidance mark represents the distance to a flat road surface. Therefore in the case of an upward slope behind the car, the distance guides are displayed closer to the rear bumper than the actual distance. For example, if there is an obstacle on the upward slope, it may appear farther away than its actual position. Also, an error may occur between the guidance and the actual path of the car on the road surface. When there is a steep downward slope behind the car (example) In the screen, according to the distance guidance marks, the truck seems to be parked about 1 m away (at the position B). In actual fact, however, if you reversed to position A, you would collide with the truck. In the screen, positions A, B and C seem to be located in order of proximity. However, in actual fact, the position A and C are the same distance, and B is farther away than positions A and C. • The car width extension mark represents the distance to the road surface. The distance to an object on the road is not accurately represented by the guides. Error between the screen and the actual road surface In the following conditions, errors are produced between the screen guidance and the actual road surface. (The illustrations represent a case when the camera is installed in the standard position.) Error Error In the case of a downward slope behind the car, the distance guides are displayed farther from the rear bumper than the actual distance. If there is an obstacle on the downward slope, it seems closer than its actual position. Also, an error may occur between the guidance and the actual path of the car on the road surface. 77-EN