How sensitive is HD radar? - SailNet Community
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post #1 of 18 Old 01-19-2011 Thread Starter
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How sensitive is HD radar?

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I am looking for peoples feedback on HD radar. I am planning to buy a system and was wondering if anyone knows if it is sensitive enough to pick up icebergs and if so to what size.

Also I would appreciate feedback on proven models.

If you want further information check out my expedition blog at
www (dot) belzebub2 (dot) com

Thanks for your advice!
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post #2 of 18 Old 01-19-2011
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At what range? HD radar is generally better at picking up fine detail close to the boat, but tends to have issues at longer ranges.

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post #3 of 18 Old 01-19-2011
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From what I've heard the new gen units will pick up crab/lobster floats.

Never having sailed around icebergs, is there an issue with standard RADAR not picking them up?


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post #4 of 18 Old 01-19-2011
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I have a vague memory that ice is a good insulator; therefore, it would not reflect a radar pulse very well. I could be wrong about this, but I am thinking it would be better to err on the side of safety on this. Instead, you might think of forward looking solar such as the Echopilot.
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post #5 of 18 Old 01-20-2011
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Suggest you PM BillyRuffin'. He's been near glaciers at least, and associates with other cruisers that go to high lattitudes. He has an older radar set though, so he may only know about the non-HD radars.

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post #6 of 18 Old 01-20-2011
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If radar picks up rain and sea scatter, why not ice?
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post #7 of 18 Old 01-20-2011
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Rain is liquid, ice is solid. The humidity meters can detect water ina body but not ice. The radar can detect rain but not ice.
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post #8 of 18 Old 01-20-2011
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Quote:
Originally Posted by celenoglu View Post
Rain is liquid, ice is solid. The humidity meters can detect water ina body but not ice. The radar can detect rain but not ice.
Not true! Considering I have personally seen ice bits and bigger chunks on my own 4kw radar and have had conversations with a friend who used to run an oil tanker about bergs, bits & growlers about the only thing that is true is that not all bergs make a good reflecting target. You also have no protection for those bergs that float just below the water. Low lying bergs with soft rounded tops from ocean wash also don't show up well as they can often lack a proper reflecting angle. Radar CAN see ice but not all ice makes a good target...

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Last edited by Maine Sail; 01-20-2011 at 07:48 AM.
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post #9 of 18 Old 01-20-2011 Thread Starter
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Thanks for the great info! I heard that growlers and bergy bits dont always show up. I think a mix of a forward facing sonar and radar is the way to go here. Any suggestions regarding a specific type of Radar or Sonar.

Please feel free to check out my trip blog there is more interesting info on that Northwest passage on a shoestring
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post #10 of 18 Old 01-20-2011
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Quote:
Originally Posted by Maine Sail View Post
Not true! Considering I have personally seen ice bits and bigger chunks on my own 4kw radar and have had conversations with a friend who used to run an oil tanker about bergs, bits & growlers about the only thing that is true is that not all bergs make a good reflecting target. You also have no protection for those bergs that float just below the water. Low lying bergs with soft rounded tops from ocean wash also don't show up well as they can often lack a proper reflecting angle. Radar CAN see ice but not all ice makes a good target...
That's kinda what I thought. Except that part about icebergs floating just below the water (my emphasis). Bergs may be awash at times, but ice floats.

Last edited by SlowButSteady; 01-20-2011 at 10:47 AM.
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