Originally Posted by BarryL
On the GPS units I have used (2 lowrance and 2 garmin) the gps speed readings are instantaneous. The lowrance responds faster, if the boat surfs down a wave the speed shows it right away. If the boat rolls in a swell, the speed can show that as well. The garmin is a little more damped, it responds to surfing a little slower and doesn't seem to respond to rolling.
I believe that the model may also be a factor. Older units have slower processors. Also, any GPS will only tell you the speed that you were doing, as speed can only be calculated over the distance that you have traveled.
My old Signet Marine unit died this year, after the transducer was painted by the yard
, and then I scraped the paint off with a wire brush
. I plan to replace it with a transducer that can shoot through the solid glass hull of my O'day 35.
Would anyone here care to recommend a specific model that they are happy with?