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Old 18 November 2007, 06:58   #1
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side imaging sonar

Hi i am looking at buying a humminbird 797c2 si combo,this is gps/fishfinder with side imaging sonar built in.Cost in uk circa £1000,cost from us circa £420.My question is will the us model be compatable with uk charts?
which are available in navionics gold mmc or sd cards.
cheers adrianevo.
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Old 18 November 2007, 19:40   #2
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A dive buddy of mine just got one of these (not sure it's the same model as what you're looking at.)

She was less than impressed with it's performance. She's only been out with a couple of times, though.

jky
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Old 21 November 2007, 04:36   #3
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Quote:
Originally Posted by jyasaki View Post
A dive buddy of mine just got one of these (not sure it's the same model as what you're looking at.)

She was less than impressed with it's performance. She's only been out with a couple of times, though.

jky
Thanks for info,maybe i'll go for the 997c si they must work
cheers adrian.
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Old 21 November 2007, 23:52   #4
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I have the 797c2 si model and have been relatively impressed with it since installing it about 6 months ago. The bottom profile display does give a nice, detailed view. Rocks, trees, even a scuba tank someone dropped overboard are easily made out. Of course, speed really affects the imaging and anything over 10 knots renders it useless. I went with the 797 over the larger 997 model due to space constraints on the top of my console. If you have the room then the bigger model would be an even better choice.
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Old 22 November 2007, 06:50   #5
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Divingthedream,

What is the maximum depth you've used it at? Our normal range is down to about 50 metres 150 feet (ish)
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Old 22 November 2007, 10:49   #6
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Simon,

Max depth so far was 105 feet (32m) to a sandy bottom with small pieces of wreckage visible on the screen. We made a dive on one of our local rigs that sits in over 700' (200m+) and the structure that did show up on the display was cool. Based upon my limited experience though, I would say their max depth rating is probably fairly accurate while the range to the sides is somewhat less than stated. Hope this helps.

Alex



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Divingthedream,

What is the maximum depth you've used it at? Our normal range is down to about 50 metres 150 feet (ish)
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Old 06 December 2007, 08:35   #7
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Sonar

Hi,

I have the 997 unit. I have sailed 2200 NM this season and found quite a lot of new wrecks, primarily in the Baltic Sea. Here the bottom is flat as a pancake and of mud and sand, therefore anything that shows up on the scanner is a good chance of being a wreck. I can get a fair picture down to 43-45m and down to 40-42 its perfect. In 25-30m the picures almost look like a really pro side scan piture. The harder the bottom is (sand), the better the picture is. The deeper you go, the narrower the angle has to be and with max. output.

Regards
Henrik
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Old 06 December 2007, 13:14   #8
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I have the 797si model. Over mud the sidescan is not very effective IMO. Its much better over hard bottoms. I am very pleased with the downlooking sonar and the GPS portions of the unit. As well as the "snapshot" functions. The screen is very viewable in daylight.

I have broken 2 of the plastic mounts though and I'm having to have a new one made on Ali. My console is too giggly for cheezy plastic mounting brackets. So bunch of pluses and a couple minuses on these units.

Richard
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Old 07 December 2007, 06:28   #9
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Diver,

They look impressive images, that's about our average depth too, might look into these units more. Would only need the sonar if it will take a position from something else and record.
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Old 07 December 2007, 07:32   #10
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Thanks Simon,

This is the the deepest scan I have made, a german 1ww light cruiser. The bottom is pure mud and the wreck is on its side, 105m long. The other is a 20 m long fishing boat, also on muddy bottom. This is the limit I think..

We have found a new wreck in 40 meters of water which was 200m from the position we used, an old Decca. We would never have found it with normal sonar and gps. This one wreck is worth it all:-)

Henrik
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