Stan, there is no way of calibrating the Wii remotes per se but if the aiming is as far off as it sounds like it is you should check in the Wii's dashboard settings to make sure the sensor bar position is correct i.e. top or bottom.
i haven't played that game on the wii, but having played many other lightgun games on the wii, it is not uncommon for the tracking to be really far off. it has alot to do with the size of the TV and how far back you are standing. the larger the tv, the worse the tracking gets. I play wii on a 102" projection setup, sensor bar on top of the screen, from about 10 feet back.(10 feet seems to be about the distance limitation before the crosshairs start disappearing randomly) at that distance, from a sitting position, if i wanted to shoot something at the bottom of the screen, i had to point roughly at the center of the screen..any lower than that and the cursor would disappear...so you had to play using the crosshairs or the games were unplayable. this was not very satisfying to me, so i ended up playing around a bit. i found that by moving the leds from the sensor bar farther apart by about 6 to 8 inches, i was able to stand back farther from the tv and still have it track properly(i can go clear to the opposite wall now, which is 21feet from the screen)..but by standing at approximately 14 feet, i can calibrate it so that the crosshairs line up with where the gun is aiming (not all games allows this, Ghost Squad does however, and that is what i was using to test this). after this is done, i can now stand at that location and turn off the crosshairs and play the game without them, which makes it alot more fun.
i wish more of the gun games allowed for this calibration and the ability to turn off the crosshairs.
anyway, my point is, if your tracking is that far off, perhaps you need to adjust your sensor bar and move back a little