"RW Salnick" wrote in message
...
Lew Hodgett brought forth on stone tablets:
wrote:
I wonder what would the best way to calibrate a depth sounder.
The only thing that counts is how much water is under the keel.
Lew
Absolutely true Lew. And yet, I leave mine set to show the depth of water
between the transducer and the sea bed. This is a built in safety margin
which I really like to have. Keeps the occasional rock, stump, etc on
the bottom from having a close encounter with my keel. Or a deep trough
from a passing Bayliner from dropping me to the bottom.
bob
s/v Eolian
Seattle
I agreed with the fact that what counts is how much water is under the keel
However, I have been, for years, using the depth to validate my position on
the chart.
Conversely, with today's electronics I could say 100 feet + 6 (draft) should
read 106 feet on the chart.
This way I could validate my position with the radar and GPS.