Sigma "System System 1000" speed / depth / log instrumentation
 

My boat is fitted with "Sigma System 1000" speed / depth / log
instrumentation, but I have no user manual.
Can anyone assist with (say) a scanned copy of the manual, or advice
on how I can calibrate the displays, set the depth alarm, and anything
else I can do with it that involves more than pressing each button
once?

Thanks in anticipation.