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Radar expectations?

Old 10-06-2008, 08:50 AM
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Default Radar expectations?


I have the Furuno 1723c with the 2.2 radome. While parked, I can see boats moving around me when the radar is set for 1/4 to 3/4 of a mile. Beyond that, I can't see the boats. I do pick up the land masses and large ships on the 3 to 10 mile setting. I read one opinion that the small boats couldn't be see on the higher distance settings because of the radar's small screen and lower screen resolution.

What should I expect to see on this radar set. (at the different distance settings?)

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Old 10-06-2008, 09:32 AM
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Default Re: Radar expectations?

You should easily see small boats within a mile from you. They might dissapear from the screen for a few seconds as they turn to an angle that does not reflect radar good, but that shoul donly be temporary. Some small boats do not have much of anything metalic on them to reflect the radar, but you should see them that close.
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Old 10-06-2008, 09:46 AM
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Default Re: Radar expectations?

Adding to Birdman's post radar tuning, weather conditions and antenna mounting affect what you see. If you are using the radar on auto I would learn how to tune it manually. PRACTICE, PRACTICE, PRACTICE!!
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Old 10-06-2008, 09:52 AM
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Default Re: Radar expectations?

Very true. And one more addtion: HEIGHT!! Height above the water, the higher the better. AND, height above "stuff" on your boat, higher is better. Look how high mine is now (see pic below). I see EVERYTHING, of course I have the new Garmin HD 24" radar, which is amazing. But my old boat had the 18" dome, and I originally had it right on top of my enclosure top and it did not perform very good. I lifted in 12" on a strut and it performed 100% better. GET IT UP!!!
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Old 10-06-2008, 12:15 PM
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Default Re: Radar expectations?

Thanks. I'll look into the height issue
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Old 10-06-2008, 12:29 PM
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Default Re: Radar expectations?


With that unit if you have it set at 10 mile range its going to be tough if not impossible to see targets very close to you unless its a breakwater or seawall. Thats why you set it at 1/4 mile range when you want to see targets close to you.



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Old 10-06-2008, 03:49 PM
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Default Re: Radar expectations?


Mine is up off the top with a wedge and the lowrance lra2000 will pick up row boats on the 5 mile setting ,

I do ajust the gain different from 5 mile to 1/2 mile . and it has radar ehco expansion thingey . with makes th blips bigger than normal for
running on higher range settings
I only use that in the fog , running with out it trains the eye to see whats in front of you and see what those small blips are in nomal mode

the river we run up to get to the boat ramp always has kyacks and row boats around to practace on when heading out or back in .

try changing your gain settings on different range settings , my old furuno worked pretty good , but i never really fined tuned it like this new one mabey your settings need to be different for longer range targets
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Old 10-07-2008, 03:58 PM
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Default RE: Radar expectations?

Might be a silly question, but have you set it up properly? I'm not familiar with your model, but most radars have to be tuned. Mine has an auto-tuning process and some of the older models required manual tuning, but I have no idea about yours.

As another poster mentioned, practice using your radar. Knowing how to adjust gain is a requirement. Other things to check are that your gain isn't just plain low while your interference/clutter/sea state/rain rejection are on and set to high. But most furuno's (old and new) are pretty good with gain set to auto.
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Old 10-07-2008, 07:19 PM
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Default Re: Radar expectations?

I think we have nearly same units (1623 2.2Kw). Mine is pretty high in the clear (at least in comparison with the size of my boat):



I however have the same problem than you. Hence the description of my case which is no reference. Playing with all gain settings always comes to compromises:

Increasing gain shows too much sea clutter. I set it manually on a .125 scale, from 10 to 20; on .250 scale from 20 to 40; on larger scales I use auto mode or manual. Too high gain hides the small targets in the sea clutter or near big targets. Too few skips weak targets. The gap between these two settings is for me very narrow and often non existing.

Sea clutter usually hides small targets as the clutter gives me about the same return as small targets.

Small (20-30 feet) wooden boats usually show up within 100-200 yards.

Again just my own set up and my inexperience. I would not rely 70% on the radar at night.
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