Firstly, welcome to OFPEC!
The usual problem is that the camera name used to create the camera is not the same as that used in the camera moves that follow. For example, from snYpir's tutorial you will have read
_cam = "camera" camcreate [0,0,0]
_cam cameraeffect ["internal", "back"]
which will indeed create a camera called _cam at the bottom left corner of the map, i.e. in the ocean.
However, when you use camera.sqs, the positional output uses the name _camera. Check your script: does it use _cam or _camera?