PLB VS handheld VHF?

iBoat Skipper Doug

Active Member
Aug 8, 2018
140
Green Bay, Wisconsin, USA
Boat Info
2003 225 Weekender w/Bravo III drive
2019 Venture trailer
Engines
5.7 MPI Mercruiser w/Bravo III drive
I need your take.

Redundant safety - PLB vs handheld VHF?

♦️Short question: For safety, should I get a personal locator beacon (PLB) or handheld VHF that floats with built in GPS / DSC? This would be in addition to already new, built in VHF with operational and registered DSC.


Background: I have 15 years of instate boating experience such as Wisconsin’s Lake Winnebago which is about 30 miles x 10 miles. Now, with a smaller trailer boat, I will be adding larger waters such as circling Wisconsin’s Door County and hopefully crossing Lake Michigan maybe once a year. I have confirmed with the local Coast Guard that 100% of this area of intended boating is covered via the VHF GPS combined “Rescue 21” distress location system as well as monitored for VHF distress calls. Of course, the area is also covered with the satellite based PLB system. I’m also a PADI scuba diver, have experience with multi-hour duration cold water exposure, and if I was forced to make a “only one” decision, I’d grab my wetsuit before I’d grab a life jacket. For Lake Michigan crossings, I would follow reasonable precautions such as checking the weather forecast, have a float plan with someone I trust, bring my wetsuit, etc.


As safety redundancy, in addition to my built in VHF with registered and operational DSC GPS distress system, I’d like to add a handheld system. I’d wear it on me. This is where I am asking for your expertise, and reasoning.


♦️You must pick only one. I don’t need to read “Get both” or that I should add a 12 person self-inflating life raft, automatically deploying commercial EPIRB, potable water-maker, enough food for a dozen days floating, and more, all in a boat that could not even carry all that stuff for inland boating.


What would you choose, a floating GPS based PLB or a floating VHF with built in GPS, DSC and distress system?


Why would you go the way you are recommending?
 
My last boat had twin engines and that’s one reason why I was stuck in one body of instate water. I did not own a trailer and had no vehicle that could tow it.


This boat has one engine, a Mercury 350 Mag and Bravo III drive, which I understand reasonably well and self-maintain. I have the official Mercury service manuals and follow their schedules or better. I pull this boat with my pickup truck.


A partial list of onboard spares includes a serpentine belt, IAC, water separating filter, spare motor oil, drive fluid, battery jump box, hose clamps, cable ties, fuses, relays, navigational bulbs, impeller, fusion tape, personally selected assortment of tools, electrical parts and mechanical hardware and yeah, I’ve changed a IAC, serpentine belt and a BIII impeller on someone else’s boat with the boat in the water. When changing the impeller with the boat in the water, I got wet, bilge pumps got a workout, but saved the weekend. Items I do not include would be either too large (example: a starter) or tool difficult to change with basic hand tools. My bigger issue is being asked on a sunny summer Saturday to help out a “friend” who I barely know fix their boat, LOL!
 
A DSC equipped handheld VHF still broadcasts over the VHF network, requiring local boaters to ALSO have their DSC equipped VHF's 'on'. Not something you can count on all the time. Plus, you run into the very limited range of a handheld VHF at less than 2' off the water.

A PLB sends out an SOS signal via satellite to rescue agencies.
 
A DSC equipped handheld VHF still broadcasts over the VHF network, requiring local boaters to ALSO have their DSC equipped VHF's 'on'. Not something you can count on all the time. Plus, you run into the very limited range of a handheld VHF at less than 2' off the water.

A PLB sends out an SOS signal via satellite to rescue agencies.

Thought “Rescue 21” 100% coverage assumes the person in distress is using a hand held VHF radio at zero feet above the water, achieved via very tall on shore towers, gaining a 100% level range at more like 35 miles before the % drops below 100%

I believe official minimum specifications for Rescue 21 is 20 miles out to sea, but locally the Coast Guard told me due to the height of the antennas on the top of the niagara escarpment, which is why Wisconsins Door County peninsula exists, the range is much higher.

http://wow.uscgaux.info/content.php?unit=170&category=dsc-vhf-radio-rescue-21
 
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I think the recommendation is based on the potential problem you are trying to solve.

A PLB should only be used in case of life threatening emergency. If your intent is redundancy should your boat be sinking and lose 12v, or is on fire and you go in the water (but have this on your person) I would say a PLB is a better option. You eliminate the variable as to whether someone else can receive the signal.

In the area you are going to be boating, you will have decent traffic and some land stations. A DSC enabled handheld is a very viable alternative, but is still line of sight signal. The coverage maps that I've seen assume the transmitting VHF antenna is 2 meters above the water, not at water level. To me, there is still some coverage risk there. Obviously a handheld has more applications - if you end up with a dead battery but the situation isn't life threatening, a handheld VHF is a better option than a PLB.

An alternative (that you don't ask about) is something like the Garmin In-Reach. This is a handheld GPS that gives you satellite mayday as well as 2 way satellite text messaging for non-emergencies, but you cant communicate with someone on the water.

I have all 3 devices above. In 40+ years of Lake Michigan boating I've never had a life-threatening emergency, but I still prepare for them. I carry the VHF when I jet ski, If I am going offshore I carry both the VHF and the Garmin. On my 40' Sundancer I have all 3 in a ditch bag.

If my primary concern was the life-threatening emergency or abandon ship, I would carry the PLB.
If I wanted VHF redundancy, recognizing some (small) possible risk of a signal issue, I would carry a VHF.
If I wanted to be able to solicit help from people off the water as well as satellite mayday, I would carry the Garmin In-Reach.

If I had to choose only 1, where you boat, probably a very good DSC handheld with built in GPS. Mine is the Standard Horizon HX870.
 
I think the recommendation is based on the potential problem you are trying to solve.

A PLB should only be used in case of life threatening emergency. If your intent is redundancy should your boat be sinking and lose 12v, or is on fire and you go in the water (but have this on your person) I would say a PLB is a better option. You eliminate the variable as to whether someone else can receive the signal.

In the area you are going to be boating, you will have decent traffic and some land stations. A DSC enabled handheld is a very viable alternative, but is still line of sight signal. The coverage maps that I've seen assume the transmitting VHF antenna is 2 meters above the water, not at water level. To me, there is still some coverage risk there. Obviously a handheld has more applications - if you end up with a dead battery but the situation isn't life threatening, a handheld VHF is a better option than a PLB.

An alternative (that you don't ask about) is something like the Garmin In-Reach. This is a handheld GPS that gives you satellite mayday as well as 2 way satellite text messaging for non-emergencies, but you cant communicate with someone on the water.

I have all 3 devices above. In 40+ years of Lake Michigan boating I've never had a life-threatening emergency, but I still prepare for them. I carry the VHF when I jet ski, If I am going offshore I carry both the VHF and the Garmin. On my 40' Sundancer I have all 3 in a ditch bag.

If my primary concern was the life-threatening emergency or abandon ship, I would carry the PLB.
If I wanted VHF redundancy, recognizing some (small) possible risk of a signal issue, I would carry a VHF.
If I wanted to be able to solicit help from people off the water as well as satellite mayday, I would carry the Garmin In-Reach.

If I had to choose only 1, where you boat, probably a very good DSC handheld with built in GPS. Mine is the Standard Horizon HX870.

Thank you.

Funny, if I go with the handheld VHF, I am leaning toward the same unit you have, a the Standard Horizon HX870.
 
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It’s interesting that you seem to say you carry wet suits for all passengers, but won’t bother to have both a handheld VHF and a PLB. Or are you saying you’ll put on your wet suit, but leave your shipmates to the elements?

You say you don’t want to hear an answer of “both”, but that’s the real answer. Immersion suits or dry suits for all crew would be way better than wet suits. A small coastal raft would be cheaper and weigh less.

PLB and VHF are complimentary devices, not an either or decision. If you insist on a single answer it’s get the PLB.
 

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