Bud:

I replaced the failing KVH instruments in my 1998 boat with Raymarine ST60
speed and depth and used the old transducers. They worked fine. The old
transducers were Airmar as are the new ones that came with the Raymarines.
It was an exact wire for wire, color for color matchup.

FWIW, the thruhull glands were entirely different. So, it would not have
been possible to simply pull out the old transducer and pop in the new. If
the old transducers are incompatable with the new ones as Larry suggests in
his post, I would haul the boat, pull out the old glands and install new
ones in their place.

David
"bud" wrote in message
oups.com...
I am replacing the very old electronics on my 1977 Hunter 30 sailboat.

I want to use the Raymarine ST40 bidata instrument, but I wonder if I
can use the existing transducers for deptch and speed. The old depth
is a Standard DS1.

Any thoughts on this? If not reasonable, do I just install the new
through hull transducers and leave the old ones in? or remove the old
ones and try to fit the new ones in the same holes?

thanks,
Buddy E