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Old 13-01-2016, 17:21   #1
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What happens when your navigation systems fails

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Iran freed ten U.S. sailors on Wednesday a day after detaining them aboard two U.S. Navy patrol boats in the Gulf, bringing a swift end to an incident that had rattled nerves shortly before the expected implementation of a landmark nuclear accord.

Iran's Islamic Revolutionary Guard Corps (IRGC) said it had released the sailors after determining they had entered Iranian territorial waters by mistake. IRGC Rear Admiral Ali Fadavi said earlier the boats had strayed due to a broken navigation system.
Iran frees U.S. sailors swiftly as diplomacy smoothes waters | Reuters

Seen on a Canadian CG vessel

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Old 13-01-2016, 17:24   #2
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Re: What happens when your navigation systems fails

New technology, same old story. I remember from years ago hearing about a group of British Marines on Gibralter misreading their map and accidentally invading Spain.
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Old 13-01-2016, 17:32   #3
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Re: What happens when your navigation systems fails

A good reason to always keep a spare laptop with a bootleg copy of MaxSea aboard!

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Old 13-01-2016, 17:47   #4
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Re: What happens when your navigation systems fails

You use a paper chart, plotting paper, and a sextant.
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Old 13-01-2016, 17:55   #5
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Re: What happens when your navigation systems fails

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Originally Posted by jackdale View Post
Jack, I'm not sure what I'm supposed to take from that photo? But I do note that there is a magnetic compass there amidst all those electronic and electric devices and circuits. Not the best place for such IMO! What sort of vessel was that, and was that the primary navigation compass?

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Old 13-01-2016, 18:02   #6
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Re: What happens when your navigation systems fails

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Jack, I'm not sure what I'm supposed to take from that photo? But I do note that there is a magnetic compass there amidst all those electronic and electric devices and circuits. Not the best place for such IMO! What sort of vessel was that, and was that the primary navigation compass?

Jim
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Read the label below the GPS screen.

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Old 13-01-2016, 18:09   #7
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Re: What happens when your navigation systems fails

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Originally Posted by blewett_john View Post
You use a paper chart, plotting paper, and a sextant.
Yes, yes and yes.

In Canada we are required to use paper publications.

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Most vessels of any kind in Canada have an obligation to carry and use official charts and publications and to keep them up to date. The chart carriage requirements are listed in the Charts and Nautical Publications Regulations, 1995 of the Canada Shipping Act.
CHS paper charts meet the requirements of the chart carriage regulations. CHS digital charts meet the requirements of the chart carriage regulations under certain circumstances. CHS Electronic Navigational Charts (ENCs) meet the requirements provided they are used with an Electronic Chart Display and Information System (ECDIS). CHS raster charts meet the requirements only if paper charts are carried and used as a backup.
For further information on which charts meet the official requirements, please see our CHS Official Products and CHS Licensed Manufacturers.
If you have sufficient local knwledge the requirement is waived.

I also know how to use electronic navigation systems.
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Old 13-01-2016, 18:10   #8
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Re: What happens when your navigation systems fails

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Originally Posted by Reefmagnet View Post
A good reason to always keep a spare laptop with a bootleg copy of MaxSea aboard!

Sent from my SGP521 using Cruisers Sailing Forum mobile app
The CG also is expected to use current paper charts.
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Old 13-01-2016, 18:22   #9
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Re: What happens when your navigation systems fails

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The CG also is expected to use current paper charts.
The problem in this scenario is that fixes pencilled on a chart can only be made at periodic intervals and may or may not be accurate in the absence of a functioning tail-wagging-dog gps which may or may not have alerted them to their unintended intrusion.

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Old 13-01-2016, 18:57   #10
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Re: What happens when your navigation systems fails

GPS is cheap... you can have several.. and should... and portable ones too.

Samsung Smart phone,
Raymarine MPF plotter with external antenna
Standard Horizon plotter 2 with external antenna
B&G MPF cockpit plotter w/ internal antenna
Garmin hand held plotter
Stnd Horizon hand held DSC VHF
Stnd Horizon fixed mount DSC VHF
Yoeman plotter w/ paper charts

coming soon AIS B Vesper Visionmate
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Old 13-01-2016, 19:36   #11
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Re: What happens when your navigation systems fails

I'm not a conspiracy theorist but the Iranians definitely have the technology to "spoof" GPS and cause a plotter to think it is somewhere other than where it really is. It's possible they got tired of these guys constantly going by their island just 50 yards outside the limits. A little GPS spoofing could have lured them into the no-go zone and created an incident just like this.

I seriously doubt that all the GPS units on 2 boats stopped working at the same time...
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Old 13-01-2016, 19:41   #12
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Re: What happens when your navigation systems fails

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I seriously doubt that all the GPS units on 2 boats stopped working at the same time...
That would be one heck of a coincidence.
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Old 13-01-2016, 19:50   #13
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Re: What happens when your navigation systems fails

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Originally Posted by jackdale View Post
That would be one heck of a coincidence.
Unless the offset clock was beamed locally (aka Jamming) by the other guys....
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Old 13-01-2016, 20:34   #14
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Re: What happens when your navigation systems fails

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Unless the offset clock was beamed locally (aka Jamming) by the other guys....
That might be why the Naval Academy has re-introduced celestial navigation .
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Old 13-01-2016, 20:38   #15
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Re: What happens when your navigation systems fails

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That might be why the Naval Academy has re-introduced celestial navigation .
And don't push the boundaries on cloudy days!
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