[B-Faithful]

I tried to search what the cone angles are on the Lowrance transducers. This is what I found on the Lowrance site: http://support.lowrance.com/system/s...RTICLE_ID=2969

We offer a variety of 200 kHz transducers with either a wide (20°) or narrow (12°) cone angle. The 50 kHz transducers come with a 35° cone angle. The dual-frequency transducers come with both a narrow (12°) 200 kHz and a wide (35°) 50 kHz cone angles. And the dual-search transducers come with both a narrow (12°) 200 kHz and a wide (35°) 83 kHz cone angles.

I also found this: http://www.chsmith.com.au/Products/L...ansducers.html

'Shallow' water HST-WSBL 106-72 transducer will operate on 2 frequencies on the HDS models: 200 (20°) & 83KHz (60°).

'Deep' water HST-DFSBL 106-77 transducer will operate on 2 frequencies on the HDS models: 200KHz (12°) & 50KHz (35°). This compares to the Airmar P66 (ESA931) 200 (11°) & 50KHz (45°).

Looks like the shallow water 200/83 has a wide cone at both frequencies (probably not the best for bottom fishing since the cone is so wide at 200kHz) and the deep water 200/50 is closer to the p66 but only has a 35 degree cone at 50kHz.

Here is a discussion between the p66 and Lowrance transducers:http://www.thehulltruth.com/marine-e...hds-5-a.html#b

Note that the p66 is a cheap Airmar transducer at less than $100. I think it is better for fishing the bay than the more expensive high power 1kw transducers because you get a very wide cone at 50kHz. My fish finder is a full 1kw capable unit and I would stick with the p66/b60 even if I was given a higher power 1kw transducer.

Here is a chart that shows how much area a given cone angle covers at a particular depth