wingdiver
Well-known member
Hi
Need some input from folks who know about these things.
I've been having a conversation with my father-in-law about depth sounders.
He has one of the old spinning red light ones and a NASA one which has given up working.
In looking at replacements, he has been advised that, for shallow waters, he should get a dual frequency system.
Now, I have Raymarine gear and this seems to work pretty well and let me know when I am about to go aground (should pay more attention sometimes /forums/images/graemlins/blush.gif )and this seems to be a single frequncy 200khz system.
Many of the dual frequency systems seem to work on 50khz and 200khz.
As far as I can tell, the lower frequency gives a broader angle of 'view' and is good for deeper waters where the lower frequncy signal penetrates better. The higher frequency is better for shallower waters.
If that is the case, and he is obviously more interested in shallow water accuracy, why would he need to go to the expense of a piece of kit which adds a second, low frequency that helps with accuracy at depth.
Cheers
D
Need some input from folks who know about these things.
I've been having a conversation with my father-in-law about depth sounders.
He has one of the old spinning red light ones and a NASA one which has given up working.
In looking at replacements, he has been advised that, for shallow waters, he should get a dual frequency system.
Now, I have Raymarine gear and this seems to work pretty well and let me know when I am about to go aground (should pay more attention sometimes /forums/images/graemlins/blush.gif )and this seems to be a single frequncy 200khz system.
Many of the dual frequency systems seem to work on 50khz and 200khz.
As far as I can tell, the lower frequency gives a broader angle of 'view' and is good for deeper waters where the lower frequncy signal penetrates better. The higher frequency is better for shallower waters.
If that is the case, and he is obviously more interested in shallow water accuracy, why would he need to go to the expense of a piece of kit which adds a second, low frequency that helps with accuracy at depth.
Cheers
D