REAL Cheep way, no, but there is a way. I made an adapter board ($90) for the DMI speed transducer to talk to the ST60 speed display($80 on ebay), Raymarine makes the Seatalk to NMEA converter E85001 ($160 new).
I believe the DMI depth puck is a 200khz unit, if it is it can hook directly to a Raymarine ST60 depth instrument, I've seen them on Ebay for around $150 display only.
Once you have the converter, you can also hook it to a laptop for navigation software......You can do it for under $500 which is cheep when you consider the list prices on new ST60 instruments.....
Raymarine (Airmar) speed paddle wheel sensors have a hall effect sensor and 0 to 12 volt output. ( 12 volt power, signal, gnd) The older DMI have a 2 wire low level signal requiring excitation on the signal wire.
Did not know about the actisense NMEA converter, looks like a great product!
Cal 9.2 #19 SilverSwan
Last edited by roline; 02-07-2010 at 09:30 AM.