New Fishfinder GPS

[Bassvergnugen]

I'm going to make the leap shortly and get one of the newer fishfinder/GPS units. Still a little torn between which one and currently pouring over the posts to help me decide. The question I have that I haven't seen posted yet is about the sonar reading at speeds over 20 mph.

What should I expect to be able to see when moving at higher speeds? Will the units show contour, structure and fish while traveling at 15/20 mph? My current model (Navman 4150) doesn't really show a lot of anything other than depth. Just want to know what to expect.

Thanks,
Joe

[fasttrack]

My HB setup with shoot-thru transducer for on-plane only gives me depth but no detail. I assumed that I didn't get it set right in the epoxy but maybe that's the way it always is (?). I lose graph detail at 20-25mph. Others who know more about this will probably reply, but that's been my experience.

[McCarter]

i still need to get a high speed transducer for my HB 798.  Anytime i get over 15 mph i lose everything and the depth usually goes into the thousands.  Luckily for me i only fish kent lake and have learned the hazards to avoid over the years, except for the boat ramp when they draw the lake down

McCarter himself

[LipRip]

u go 15mph on kent!? u r breaking the law sir

[fiker]

I have the 898 SI unit on my dash, and the 788c on the bow.  I have them interlinked together.  I also have the high speed transducer epoxied into the bottom & connected to the 898 via a Y cable. 

The high speed set up for the 898 works perfectly.  It is everything I wanted when I decided to go this route.  With the Y cable the electronics just do everything automatically.  No switches to throw, no settings to make, .... nothing.  Just enjoy it.

There is however, one improvement that I'd make if I were  a Humminbird engineer. 

The chart speed doesn't automatically adjust itself to which transducer I'm using.  So if I set it at say 5 when I'm using the SI, the it will continue to be at 5 when it switches over to the other transducer at higher speeds.   I'd like to be able to set it to run faster at high speeds.