How to handle my existing bottom survey data.

[Discreet]

Hi everyone,

I have a question about how to handle my existing bottom survey data.
I previously created a survey of my main fishing area using my old setup, which was a single-beam system without the Furuno SCX20 satellite compass. This year I upgraded my system and now I have both the SCX20 satellite compass and the DFF-3D multibeam module.

I’m wondering what would be the best approach:

• Should I start scanning from zero with the new system?
• Or should I scan over the existing single-beam data (without the satellite compass) that I already have?

If I scan over the old survey, will the new data replace the old one, or will it be averaged/combined with it?

What do you recommend in order to get the most realistic and accurate bathymetry possible?

Thanks in advance for your advice!

 

[Johnny Electron]

We need a bit more clarity to answer. Your old setup was collecting bathy where/how? Was it being done with a TZT3 or a Nobeltec software package on a PC? Now with your new setup, is that with TZTXL or Nobeltec Software on a PC?

 

[Discreet]

Hi Johnny, My old setup was collecting bathy though Navnet TZT3 + timezero 3. I´ve exported all the bathy and imported to my new TZTXL touch 10x + timezero 5.

 

[jp498]

Make sure your heave compensation and sat compass lag settings are set up in both the TZTXL and the PC. A big part of DFF3d is fine tuning the angle as well; find a flat medium depth (50-250 ft) spot to run back and forth making sure it lays down the recording not tilted. Adjust correction angle in the software or XL as needed so that depths across the swath remain consistent going opposite directions. Few boatyards manage to install a transducer exactly plumb straight down. It's common to need 2 degrees or so correction.

You can just keep a backup of your old data in case you change your mind or don't like the way they mix.
On the PC, the old data will be the "imported" database which you can turn on/off if you exported/imported to get it into tz5. If you upgraded with the same PC, it will probably still be user data and will get overwritten/averaged with the new dff3d data. With 50x as much data with the dff3d, here is essentially no difference between overwriting and averaging.
If you fish in greater depth than the Dff3d could do, the single beam might be able to do deeper mapping even if slower.

 

[snappermiles]

i would keep the old data and then over write it as you hit each spot with the better dffd3d, no use throwing all that data and starting again