Reply
 
Thread Tools Search this Thread Display Modes
 
Old 11-09-2018, 07:39 AM   #1
Member
 
slolooper's Avatar
 
City: Cruising
Country: USA
Vessel Name: Patriot
Vessel Model: Ocean Alexander 548 PHMY
Join Date: Jun 2016
Posts: 10
Question MOB Alarms 2018

Anyone have any experience with any of the new generation MOB alarms. Wife and I have decided that if one of us slipped overboard underway the helmsman could easily not notice for awhile. Looking for something simple like Crewwatcher https://crewwatcher.com/pages/features But it needs to work.
__________________
Advertisement

slolooper is offline   Reply With Quote
Old 11-09-2018, 08:41 AM   #2
Senior Member
 
BrianSmith's Avatar
 
City: Wherever Smartini is
Country: USA
Vessel Name: Smartini
Vessel Model: 2002 Kristen 52' Flybridge Trawler
Join Date: Mar 2014
Posts: 254
My wife researched these extensively, and we ended up with a couple of ACR RescueMe MOB1's. They are attached to our PFD's. When they get wet, they send a signal to any AIS receiver within a four mile range, and make a DSC radio call to our VHF. Haven't had to use it yet, but we like what it's SUPPOSED to do!
http://oceansignal.com/products/mob1/
__________________

BrianSmith is offline   Reply With Quote
Old 11-09-2018, 09:34 AM   #3
Guru
 
O C Diver's Avatar
 
City: Fort Myers, FL... Summers in Crisfield, MD
Country: USA
Vessel Name: Slow Hand
Vessel Model: Cherubini Independence 45
Join Date: Dec 2010
Posts: 6,173
Quote:
Originally Posted by BrianSmith View Post
My wife researched these extensively, and we ended up with a couple of ACR RescueMe MOB1's. They are attached to our PFD's. When they get wet, they send a signal to any AIS receiver within a four mile range, and make a DSC radio call to our VHF. Haven't had to use it yet, but we like what it's SUPPOSED to do!
MOB1 - Ocean Signal
Looks interesting. Was reading through the user manual. It says, service center battery replacement even after modest use. Curious if you researched the cost and availability of battery replacement.

Ted
__________________
Blog: mvslowhand.com
I'm tired of fast moves, I've got a slow groove, on my mind.....
I want to spend some time, Not come and go in a heated rush.....
"Slow Hand" by The Pointer Sisters
O C Diver is offline   Reply With Quote
Old 11-09-2018, 01:01 PM   #4
DDW
Senior Member
 
City: San Francisco
Country: USA
Join Date: Apr 2018
Posts: 479
I have never used one in anger, but I have many: Raymarine MOB system, McMurdo PLB, inReach, and OceanSignals MOB1.

Practically speaking from the written experiences of many MOB situations, the three issues are: Realizing that there is an MOB, finding them again, and getting them back on board.

The Raymarine and Crew Watcher are similar in that you will get an alarm within seconds of an MOB event. It will take awhile, perhaps several minutes to take action and turn the boat around. The MOB may now be 1/4 away. In a seaway, you have a very good chance of not seeing them. The Raymarine sets a waypoint at the event, giving you something to navigate back to but discounting drift. The Crew Watcher provides a vector, but only over very short distances.

The PLB or inReach can alert authorities in SAR, but this is a very time consuming process. The Coast Guard will call the emergency numbers to verify that it is not one of the 99% that are false alarms, locate SAR resources to mobilize them, etc. It could be several hours before any are on scene, and if they have no way to contact the boat, the boat is searching blind. Also the boat might be many miles away by then, if the off watch is taking a nap.

This leaves AIS beacons like the MOB1. Within minutes, it will make a DSC call to your boat. If that is not acknowledged quickly, it will make an all ships emergency DSC call. Your current position will automatically appear on the chartplotter. This gives the best chance of finding the MOB by your boat, or another boat.

Of those systems I like the MOB1, and it's the one I take with me on deck for the night watch (offshore on the sailboat). It can be installed on your inflatable vest so that it starts up automatically when the vest goes off. It can be tested, and the tests use a small amount of battery capacity. The battery is expensive to replace. I don't mind having to replace it after modest use (what is modest use? 1 or a few MOB events? well worth it....). There is really no reason to test it frequently enough to be concerned about the battery.
DDW is offline   Reply With Quote
Old 11-09-2018, 01:14 PM   #5
Guru
 
O C Diver's Avatar
 
City: Fort Myers, FL... Summers in Crisfield, MD
Country: USA
Vessel Name: Slow Hand
Vessel Model: Cherubini Independence 45
Join Date: Dec 2010
Posts: 6,173
I refuse to buy anything like this without cost and availability of battery replacement. It should last a long time and ideally shouldn't be used, but lets be straight forward, lithium batteries do get bad batches. If it's not user changeable, then I need to know where to send it, how long, and how much.

This is like buying an $800 smart phone that the battery can't be easily changed in. It's good till it's not.

Ted
__________________
Blog: mvslowhand.com
I'm tired of fast moves, I've got a slow groove, on my mind.....
I want to spend some time, Not come and go in a heated rush.....
"Slow Hand" by The Pointer Sisters
O C Diver is offline   Reply With Quote
Old 11-09-2018, 04:46 PM   #6
DDW
Senior Member
 
City: San Francisco
Country: USA
Join Date: Apr 2018
Posts: 479
O.S. says you have to send it back, but the kits are available on the internet for $70 or so. It ain't rocket science.
DDW is offline   Reply With Quote
Old 11-09-2018, 07:37 PM   #7
Guru
 
LaBomba's Avatar
 
City: Beaverton, Ontario
Country: Canada
Join Date: Nov 2012
Posts: 1,004
Quote:
Originally Posted by O C Diver View Post
I refuse to buy anything like this without cost and availability of battery replacement. It should last a long time and ideally shouldn't be used, but lets be straight forward, lithium batteries do get bad batches. If it's not user changeable, then I need to know where to send it, how long, and how much.

This is like buying an $800 smart phone that the battery can't be easily changed in. It's good till it's not.

Ted
I agree Ted, I had a McMurdo PLB and, although never used, after 5 years they wanted nearly the price of a new one just to change the battery. Battery replacement was mandatory for continued activation. I threw it out!!
__________________
Allan & Ann
LaBomba is offline   Reply With Quote
Old 11-12-2018, 06:01 AM   #8
Senior Member
 
BrianSmith's Avatar
 
City: Wherever Smartini is
Country: USA
Vessel Name: Smartini
Vessel Model: 2002 Kristen 52' Flybridge Trawler
Join Date: Mar 2014
Posts: 254
Quote:
Originally Posted by O C Diver View Post
Looks interesting. Was reading through the user manual. It says, service center battery replacement even after modest use. Curious if you researched the cost and availability of battery replacement.

Ted
Ted,

I assume "modest use" means it went off after someone fell in the water. If that happens, and we get the someone back onboard, then I'll worry about replacing the battery.

I should have said that our PFD's all have a water-activated strobe light, too. So with a DSC call and an AIS alert when the person goes in the drink, an AIS target to drive the boat to, and a flashing strobe light to look for in low light conditions, I like our chances better than any other combo of things the Safety Department researched.
__________________

BrianSmith is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





All times are GMT -5. The time now is 12:13 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012