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Garmin 741xs and 18xHD abilities?

Old 03-10-2014, 03:14 PM
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Default Garmin 741xs and 18xHD abilities?

Hi all,

I have had a search and cannot find the info I am chasing. I already have the 741xs and am looking at adding radar. My main reason for wanting this is to track large container ship direction at night. I have read about the 'collision avoidance' option but wondering if just the radome interfaced with the 741 will give me the ability to see what direction ships are travelling. Any real life experience with this combo will be greatly appreciated.

Cheers
Old 03-10-2014, 05:36 PM
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Sounds like AIS might be a good investment for you.
Old 03-10-2014, 09:04 PM
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I do not own the 741xs but have the garmin 740s and any question I could come up with calling GARMIN has been my best solution f that fells ask Gill
Old 03-11-2014, 12:19 AM
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The 741 + radar can give you manual target tracking (MARPA). But without an additional heading sensor, MARPA will not work well unless you are running fairly fast (20+ knots, if there's significant current).

If you want MARPA at very low speeds, you must have heading data from a heading sensor. For low-budget heading data, I would guess that a Lowrance Point-1 will give good enough heading data for usable MARPA (although it's not recommended for that use). The "problem" with MARPA is that it's a manually started process. You need to select a target and initiate radar tracking. It won't automatically select a dangerous target for you, which could be useless to you if you want hands-off warnings.

As Whaler27 said, AIS might be a better bet for your purposes. The big ships are very likely to be broadcasting AIS data, and that will generate hands-off warnings of potentially dangerous targets. Receive-only AIS will warn you, but a 2-way AIS transceiver could show the big boys where you are as well. And AIS works well at all speeds.

AIS and radar are complementary, and which you choose first will depend on your environment and usage.
Old 03-11-2014, 08:30 AM
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Thanks very much. Great feedback and much appreciated. AIS it will be for starters
Old 03-11-2014, 03:08 PM
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Another feature about the newer xHD radars is that they support dual ranges at once.

I am in the Chesapeake Bay and we have ships that run upto ~18kts at times that can be on us in a hurry as we troll the channel edges at 3kts. Being able to run dual ranges gives the ability to scan at a further range to see what is coming down the bay and one range in close for collision avoidance with what is in close to you. I think that is a great feature on the newer radars. I am not sure a 7" screen would support two ranges though.

PS. I also get AIS ship tracking on my iPhone for $5 a year with the application "Ship Finder". In the Chesapeake we are within cellular phone range nearly all the time. I am not sure if it works where you are.
Old 03-11-2014, 05:36 PM
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Originally Posted by iFishMD View Post

PS. I also get AIS ship tracking on my iPhone for $5 a year with the application "Ship Finder". In the Chesapeake we are within cellular phone range nearly all the time. I am not sure if it works where you are.
I also use this AIS ship tracking app on my iPhone and I've found it to be useful, but misleading. It shows the ships in the area, but on several occasions I have found the ships position to be off by several miles.....as in I've looked south of my vessel for the ship and found it north... Relying on this app to tell you where ships are could get you run over!

Apparently there is sometimes quite a delay in the position updating...

Just a friendly FYI. Be safe out there!
Old 03-11-2014, 05:56 PM
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Originally Posted by ejthomp View Post
I also use this AIS ship tracking app on my iPhone and I've found it to be useful, but misleading. It shows the ships in the area, but on several occasions I have found the ships position to be off by several miles.....as in I've looked south of my vessel for the ship and found it north... Relying on this app to tell you where ships are could get you run over!

Apparently there is sometimes quite a delay in the position updating...

Just a friendly FYI. Be safe out there!


I agree. I have noticed them being off a times. However you can see the direction they are moving in order to know when to keep an eye to the radar.

I personally think radar is more important for low vis navigating and recommend getting radar before AIS. This way you have eyes for non AIS targets too

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