what about chirp

i live in southern middle Tennessee, and fish 12 months of the year, 70% of the time i fish deep 14 to 26 ft or deeper. the exception would be the spring time . i guess the main thing i am looking for besides mapping and a good gps is structure id.( brush,standing timber )ect. and how the fish are responding to it. like the way crappie will stack up , are they active (above) the brush or not so (down) in the brush ect. better target separation, was what i had in mind but also side view to get a wider view while running river channel and contour lines and down imaging for a better look. 360 would be nice ,but that would all most double what i am looking to spend. but from what i learning from you guys is its not that simple. but still better than what i am use too. thanks for all the info. please keep coming i want to learn all i can.

This is regular Sonar ... Blobs like we are used to ...

http://i477.photobucket.com/albums/r...psff8vpjjm.png

This is CHIRP ...(at fixed frequency in this example) ...

http://i477.photobucket.com/albums/r...pspqqwzteq.png

Prettier arches no doubt ...

One huge benefit is being able to select any frequency within the bandwidth ...and not be stuck with 200kHz or 83kHz ...

Rickie

Rickie .... what are your thoughts about why a chirp unit is better at a fixed frequency?
Good point on the ability to be able to choose what frequency you want to run.

Quote:

---

Originally Posted by BobB

Rickie .... what are your thoughts about why a chirp unit is better at a fixed frequency?
Good point on the ability to be able to choose what frequency you want to run.

---

I would offer to alter that slightly and say "why is a CHIRP unit better at a fixed frequency in shallower water" ...

The biggest benefit I have read is the ability to alter the cone angle to match the Enviromental conditions for that specific point in time (changing the frequency effectively changes the cone angle) ...

Shallow water doesn't really need the CHIRP sweep frequency characteristic of being able to transmit more power into the water (than toneburst pulse Sonar) with less associated noise ...

So the higher quality processing of the CHIRP sounder ... and the ability to micro-adjust the cone angle to meet the specific conditions seem to be the benefits in shallow water ...

Rickie

At least some of these fish,suspended above the tree stump are crappie.I see them on the 200khz.Chirp,used here,on a fixed frequency would show better target separation. I doubt it would help enough to make any difference tho.?http://i826.photobucket.com/albums/z...psp3egvcfd.jpg

kosmo looking at your first picture it is easy to interpret i can all most see the down image in my mind, Rickie your picture without chirp , is harder if on my home lake ( Tims Ford ) with out down scan i would guess i was looking at bait , not beaning flatten out maybe some bass following not in full feeding mode . but in the second picture with chirp it looks more like a school of white bass . another good name for this post would be , what you need to know before you buy a good unit.