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GMR 24x HD vs. 18xHD

Old 02-22-2015, 05:00 PM
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Default GMR 24x HD vs. 18xHD

Looking to pick up an new Garmin system 7612xsv and love to be offshore and was wondering what's the main difference between the two radar's I rarely run at night but I am planning doing overnights

Thanks
Old 02-22-2015, 05:15 PM
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The units listed are very similar. What type of boat will this be mounted on?
Old 02-22-2015, 05:17 PM
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Beam width which translates to the ability to see smaller objects and separate close proximity objects.
Old 02-22-2015, 05:55 PM
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It will be going on my seapro 270express. It is 9'2" wide. My profile pic. I am replacing my raymarine C80 2kw system
Old 02-22-2015, 06:01 PM
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Originally Posted by Bntarrw View Post
It will be going on my seapro 270express. It is 9'2" wide. My profile pic. I am replacing my raymarine C80 2kw system

Do you plan to use it to search for birds or is it for navigation? If it is for birds the best bet would be an open array. The dome will in fact see birds but you will have to tune it properly. If it is for navigation and some fishing on your boat I would go with the 24XHD.
Old 02-22-2015, 06:29 PM
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International Mike,
That's what I needed to hear thanks you for the info!!!!!
Old 02-22-2015, 07:40 PM
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Originally Posted by Bntarrw View Post
International Mike, That's what I needed to hear thanks you for the info!!!!!
You are welcome. You will love that radar.
Old 02-23-2015, 04:37 PM
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Originally Posted by InternationalMarineMike View Post
You are welcome. You will love that radar.
Mike,how does that 24xhd stack up to the 4gs?
Old 02-23-2015, 04:47 PM
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Both are very good products. I like the 24xHD if it was my choice, I like the software, performance, and the interface.

Others here would disagree and that OK. You would be happy with both.
Old 02-23-2015, 05:23 PM
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Where the 24 stands above the 18 is in target separation in close quarters. Due to the mounting height a 24 will show no further than an 18 at the same height. Heigth of eye is what determins distance over power. Like this a 24 sees a boat at 5 miles , the 18 will be able to see the same boat at the same didstance.
Once you know your height of eye you simply plug that into the following formula:
1.17 times the square root of your height of eye = Distance to the horizon in nautical miles
For example, if your height of eye is 9 feet above the surface of the water, the formula would be:
1.17 times the square root of 9 = Distance to the horizon in nautical miles.
1.17 * 3 = 3.51 nautical miles
This means that two boats with a height of eye of 9 feet will be visable at 7.02 miles.
At 100 feet height of eye you will be at 12.2 nm to the horizon, this would mean that a 100 ft tall lighthouse would just be visable over the horizon with a 9 ft height of eye at 15.71nm

Last edited by BoemarineBrian; 02-23-2015 at 06:08 PM.

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