I have a '95 albemarle with a dp-c1. I live in a river with a lot of shallow areas. I don't have a trim gauge but it will stop trimming as a safety feature unless i press the red button to tilt the drive. My question is can the drive be tilted at idle speed? If so, without a gauge how will i know how high i can go without damage? I read that for the newer drives you idle up to 29 degrees but never 30. Not sure that information applies to mine. Thanks for the help.