I recently bought a First 235. It has a digipak-ca system which looks like it has a depth meter, knot meter and a couple of other things. No documentation for this was included the the French-English manual that came with the boat. My boat is a 1989 model. Does anyone have a similar insturment on their boat and can they tell me how to use it? it does run off the battery power. Thank you in advance, Linda