Robert Twentyman

Tag: Technology

Why I Trust My PLB1 for Outdoor Adventures
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If, like me, you have hobbies that might result in being winched onto a helicopter, read on!

In a nutshell, if you find yourself in grave danger anywhere in the world, this device can send a distress signal to a satellite. It needs no subscription, phone signal or recharging. Provided you’re conscious, can reach your PLB1 and can use at least one hand, you have hope of rescue. The Survivor’s Club stories on the Ocean Signal website include many accounts of lives saved.

I bought mine back in 2019, when I first got seriously into sea kayaking. It came before the VHF radio or LED flares, on the basis that it was the most versatile way to get help when you really need it. I’ve carried it tethered to my buoyancy aid while kayaking and in the lid of my rucksack for hill walking ever since. I’ve never had to use it.  Yet.

PLB1 in the pocket of my Palm Peyto buoyancy aid. There’s a small eyelet inside the pocket which I thread the lanyard through to avoid losing it.

The PLB1 is a UK made, small, purpose-built device.  As the name suggests, it’s ‘personal’ – not for attaching to a vessel or aircraft, you need it on you.    It is also not for two-way communication, sending locations to your family, getting advice or checking the weather forecast.  It has one job only – getting help in an emergency.  No screen, just two buttons – TEST and ON.  It fits easily in the palm of my hand (77 x 51 x 32.5mm weight 116g).

My PLB1 – Test and On buttons shown, LED indicator and white rescue strobe at the top.

You do need to register your device (for free) via this government website. I’ve just been prompted to re-do and update mine, it took 10-15 minutes.  You will need the beacon’s Hex ID or Unique Identifying Number, the manufacturer serial number and model (all stamped on the device), your contact details, and a trusted person or persons who can explain what you’re probably up to. And who are probably not with you and in the same trouble!  This step is essential for the rescuers: they need to know whether to look for a kayak, gyrocopter or hiker, and to check whether an alert is genuine.

A short demo of my PLB1 including extending and rewinding the aerial.

Should you press the ON button, it waits 50 seconds and then sends a 406 MHz radio signal into space.  A satellite receives the signal and alerts a ground station.   A professional assessment is then made as to what kind of help is required based on where the signal is coming from i.e. land, water, mountains etc and the registration details you gave.  The most appropriate emergency services are informed i.e. coastguard / mountain rescue / police.

If it can lock onto GPS, it will send your location (accurate to within 100m).  Even if it cannot get a GPS fix, the satellites can locate you to within 5 nautical miles by radio alone.  Once active, it sends out a 121.5 MHz homing transmission which rescuers can lock onto.  It also has a small, white LED strobe to attract attention. It will keep transmitting for over 24 hours if the battery is in good order, potentially less if it has been used.  The 50 second delay is to give you time to cancel if you have made an accidental activation.

How to use it:
1. Pull out the antenna until it will go no further
2. Point the antenna vertically
3. Open the safety flap
4. Press the on button for approximately one second until the Green LED flashes.
5. The LEDs will then flash periodically to confirm transmission and GPS status.
There is a radio test feature which you are encouraged to do monthly and a more power intensive GPS test to perform annually. They ask that you only do this in the first 5 minutes of every hour as courtesy to aircraft (it transmits a short burst on 121.5 MHz, see instructions for details).

False alarms, deactivation:

It’s quite hard to set it off by accident because there is a hinged plastic flap covering the buttons. If you need to turn it off either because you’ve been rescued or because you’ve set it off in error, just press the ON button for one second until the red light flashes twice. Release, wind the aerial back in and call the UK Coast Guard.

To be aware of:
- It doesn’t float by itself. You need to buy an optional buoyancy pouch.
- It’s not designed to work in or under water (it’s waterproof to 15m, it just won’t reliably transmit). You will need to hold it up out of the water if you are floating.
- You don’t receive any confirmation that help is on the way or even that your message was received, it’s purely one way.
- There is no way to specify the kind of emergency – could be an important factor if you’re at risk of danger from other humans vs medical / sporting accidents.
- The built in battery has to be professionally replaced every 7 years, the expiry date is printed on the case and there are various service centres around the UK.
Satellite enabled smart phones and watches

Since I got this device, mobile phones and even smart watches have developed satellite connectivity.  I’ve given some serious thought to whether I still need to carry my PLB1.  For me personally, I definitely still do, though I think for a lot of people, the watch / phone uplink would be sufficient for peace of mind.  Provided you can get an unobstructed view of the sky, it’s not wet and you have sufficient battery remaining, a consumer device could solve the problem.  If you’re on the fence about that then definitely read this page on Ocean Signal’s website PLB1 vs iPhone Emergency SOS: Which Device Should You Really Trust When There’s No Cell Coverage

As they say, phones are more likely to be lost or damaged in whatever catastrophe led to the problem, their batteries are fickle, they don’t work all over the world, they don’t like wet hands, they don’t have a homing transmission for the helicopter, they won’t keep transmitting for 24 hours and you usually need to tap or type to make your request.  On the plus side, there is two-way communication and you’ve probably already got it for free (though Apple did hint at a service fee after the first 2 years).

I daresay consumer satellite tech will save a far greater number of lives due to sheer numbers of devices out there.  They are undoubtedly a great idea.   In many situations I would try my watch or phone first because they provide two-way communication. Nevertheless, I am certain they are not a complete replacement for the PLB1 in my use case.

My flotation device and essential safety kit

Have things moved on in 7 years?

Having had my PLB1 a while, I looked online to see what alternatives there are now.  Garmin make a small device that has some amazing two-way features but it does require a monthly subscription to use.   There are one or two other similar small PLBs for example, the ACR ResQLink 400 and McMurdo FastFind 220.  These appear to offer similar capabilities to the PLB1.

Conclusion

This device is a permanent fixture in my risk assessments for my trips and adventures.  I have had some amazing experiences and made memories that will last a lifetime because of the confidence it has given me.  If I ever find myself separated from my kayak floating in the sea or taking a tumble off Striding Edge, it will be the very best money I ever spent.  If mine was lost or broken it would be replaced immediately without question.

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I hope you found this useful, please do use the comments or get in touch, I’d love to hear from you.
29/07/2026
RØDE NT-USB Mini Review After One Year

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If you expect people to listen to you when you speak, the very least you can do is give them the courtesy of good quality audio. There is nothing worse than being distracted by someone who sounds as if they are talking into a yoghurt pot. It’s hard enough as it is to hold people’s attention on a video call, and you definitely don’t want to be less interesting than their inbox.

With that in mind, I decided to upgrade my setup.

I looked at various options, including Bluetooth headsets and dedicated Microsoft Teams products, but after a fair bit of research, mostly on YouTube, the RØDE NT-USB Mini kept standing out. RØDE are a well-respected brand, and this particular mic is keenly priced for what it can do. I’ve embedded a short demo video below so you can judge for yourself, but to my ear it makes my voice sound a lot warmer, more natural and less thin than the alternatives I tried, especially my old Plantronics headset.

I’ve had my RØDE since June 2025, so this review is based on about a year of daily Teams use at the time of writing. I’ve also found that it works very nicely with Final Cut Pro, allowing me to record voiceovers directly onto the timeline of my project. I use it with a dedicated RØDE spring-mounted arm, which was totally worth getting. It elevates the whole experience. I’d say it’s now frictionless when it comes to answering a call, swinging it into position and folding it away tidily when not in use.

I genuinely enjoy using this mic. If you position it fairly close to your mouth, it makes you sound at your best. I definitely now find myself speaking more slowly and with far greater confidence.

The mic itself sits in a metal U-shaped mount. It comes with a detachable magnetic desk stand. The stand is well made and stable enough, but I didn’t really get on with it because it left the mic a bit too low for my setup. That is why I switched to the arm, which suits me much better.

On the front there is a rotary volume control that also lets you switch monitoring on, so you can hear your own voice through headphones without distracting delay. Once you’ve used that properly, it is hard to go back. It makes speaking on calls or recording voiceovers feel much more natural.

Round the back, you get a USB-C connection and a 3.5mm headphone socket. I paired mine with an old set of wired Sony noise-cancelling headphones and that has worked brilliantly. They feed my voice back into my ears for monitoring and also provide the audio for Teams and Zoom calls.

Setup is refreshingly straightforward. It is class-compliant, so on Mac and Windows it is basically plug and play, with no drivers needed. RØDE also says it works with computers or tablets, and can be used with mobile devices using the right adaptor or cable. I installed the software mainly to check for firmware updates, but for everyday use I have hardly needed it at all.

One practical point: this is not the most discreet option. I can usually keep it just out of shot on a video call, but people do sometimes notice it and comment on it. That does not bother me in the slightest, and it can actually be a useful ice-breaker, but if you want something almost invisible, a headset may still suit you better.

Final thoughts

I didn’t really know what to expect when I bought this mic. I must admit, I was in two minds about whether it might be overkill or just too eccentric. One year on, it’s one of my favourite tools and it cuts across both my work and my hobbies. If you’re on the fence, just visualise your next Zoom call and ask yourself: yoghurt pot or BBC Radio 4?

How do you spell it?

RØDE is an Australian company whose roots go back to Freedman Electronics, founded in Sydney in 1967 by husband-and-wife Henry and Astrid Freedman after they moved from Sweden. The RØDE brand came later, and the Ø is a nod to the family’s Scandinavian connection rather than a standard O. It is pronounced Road, although you may also see it written online as Rode or even R0de. If you are using a Mac and want to be a stickler for accuracy, try Option + O for ø, or Shift + Option + O for Ø.

Amazon UK Links

If you would like to learn more, here is the link to my exact microphone on Amazon UK and here is the link to the professional spring-mounted arm.

Amazon affiliate disclosure: if you buy through links on this page, I may earn a small commission at no extra cost to you. I only recommend things I have used myself and bought with my own money

06/06/2026
Anker Mobile Power Bank
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When you’ve spent good money on decent tech, you quickly realise how dependent you are on it. Phone, watch, laptop. All useful right up to the moment the battery dies.

For trips away, especially anything off-grid, a reliable power bank stops being a nice-to-have and becomes essential.

I chose this Anker 20,000mAh portable charger. I’ve had it since December 2025, used it on several trips, and more recently put it through a fairly obsessive round of testing at home.

I’m very happy with it.

TL;DR
- Kept my iPhone 16 Pro going for about 4 days
- Ran out during day 5
- Recharges very quickly when you get the chance
- Built-in percentage display is genuinely useful- way better than the 4 vague LEDs you often get
- Integrated USB-C lead is a simple but excellent feature
- The last 10% does not do anything
Main features
- Built-in USB-C lead that can both charge devices and recharge the power bank
- Fast charging up to 87W
- 20,000mAh capacity, roughly comparable to a MacBook Air battery in energy terms
- Digital display showing exact remaining charge
- Can charge up to three devices at once
- Charges itself quickly, I saw around 64W in real use
- Size roughly similar to an iPhone Pro in a case
- Weight 421g. For context, my phone is 262g and a pint of water is about 840g
What is mAh?

Power banks are usually rated in mAh, which stands for milliamp hours.

In simple terms, it is a measure of how much electrical charge the battery can deliver over time.

So a 20,000mAh battery could theoretically supply:

* 20 amps for 1 hour

* 1 amp for 20 hours

That is useful, but not the best way to compare devices.

A better unit is watt hours, which accounts for voltage as well:

Wh = (mAh × Voltage) ÷ 1,000

Most lithium batteries use cells at around 3.7 volts:

20,000 × 3.7 ÷ 1,000 ≈ 74Wh

That gives you a much clearer idea of the actual energy available.

Real-world testing

Click here for my detailed test report

Anker Power Bank

Over about two and a half weeks, I ran a series of simple but repeatable tests to see what this battery actually delivers.

I tracked starting and ending percentages for both the phone and the power bank across multiple sessions, including:

* Charging my iPhone in normal overnight use

* Charging the same phone in flight mode

* Charging an Apple Watch Ultra

* Charging a MacBook Air M4

* Charging an iPad Air

What I found

iPhone performance

In normal use, the battery delivered around:

2.7% of iPhone charge for every 1% of battery used

In practice, that works out at:

roughly 2.4 to 2.7 full charges

With the phone in flight mode, the picture changes:

around 3.7% of iPhone charge per 1% of battery

That is an improvement of roughly:

35 to 40 percent – well worth having on a camping trip.

What that means in real life

A simple way to think about it is to compare how much charge you get with how much you use each day.

From my testing:

* Normal use gives about 240% total phone charge

* Efficient use i.e. flight mode gives about 300%

Worked example

If you use around 60% of your phone battery per day, for example from 90% down to 30%:

* 240 ÷ 60 = 4 days of use

* 300 ÷ 60 = 5 days of use

That matches what I saw in practice.

Apple Watch

The Apple Watch barely registers.

Each 1% of the battery delivered around 14 to 15% of charge to the watch.

In practical terms, you can charge it well over a dozen times and not worry about it.

MacBook Air

The MacBook is a different story.

Each 1% of battery delivered less than 1% to the laptop.

That is enough for a useful top-up, but not a full recharge.

iPad Air

The iPad sits somewhere in between.

Each 1% of battery delivered around 1.8 to 1.9% to the iPad.

That works out at roughly one and a half to two full charges.

The last 10 percent

One consistent finding was that the final 10% of the battery was not meaningfully usable.

Across multiple tests, that last portion delivered little or no practical charge. It is best treated as reserve rather than capacity.

Flight mode insight

The most interesting finding from all of this was the impact of flight mode.

With the phone connected normally, part of the energy is constantly being used for background activity. Syncing, notifications, general housekeeping.

Switching to flight mode removes most of that.

The result is a noticeable increase in charging efficiency. Not theoretical, but measurable.

It is a simple trick, but worth remembering if you are trying to stretch things over several days.

Verdict

This is a well thought out, practical piece of kit.

It does exactly what you want from a power bank. It is reliable, fast to recharge, and gives you a clear idea of how much capacity you have left.

In real-world use:

* Expect around 2.5 to 3 phone charges

* More if you are careful with how you use it

* Enough capacity for a long weekend off-grid without worry

The built-in cable and percentage display are small details, but they make a difference in practice.

If you are heading away from reliable power for a few days, this is a sensible thing to take with you.

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As an Amazon associate, I earn a small commission from qualifying purchases but they do not cost you a penny extra.

I buy all my own gear and write independent reviews. If you found this helpful,buy me a coffee.
21/04/2026