I would love a GPS device @HobbesOnTour but it’s impossible to justify buying it to my Yorkshire husband if my phone does the job perfectly!! Any advice on how to persuade a chap? 🤣
It's a very strange day when I'm being asked for marriage advice
Didn't you have phone problems on your Italy trip?
My semi serious / semi jokey answer is to
manipulate him, no I mean manoeuvre him into making the decision
I did a lot of touring without ever using a GPS and only using my phone or android tablet as an emergency backup. My touring was unadventurous (in the navigation sense ) following rivers, canals, the sea and well signposted routes.
Once I set my sights on going further and to places without bike paths, rivers and canals my thought process for acquiring a GPS went something like this........
What's the most likely time I'm going to need my phone?
When I have an accident or crash.
What are the chances of my phone being useful in such a scenario?
Not good.
A secondary thought was that a phone stuck out front would be attractive to a certain kind of person - the kind of person I'd rather not meet.
(As things turned out I met several of those people and in one case it would have been a lot less painful to have the phone easily lifted off the front of the bike

)
Basically, on a bike trip far from home the phone has one vitally important function - call for help - and I should try to minimise anything that might interfere with that.
Your situation is a little different in that you'll have 2 spare phones (assuming Pog is of an age to have one).
Then again, haven't you recently discovered the joys of solo bike camping?
However, the good news: if you only want a unit to navigate my suggestion is to avoid overpaying for features you don't need and go second hand. I'd expect to see a lot of second hand units post Black Friday & Christmas. Unless ancient, you shouldn't need to worry about it being obsolete and the only other issue to consider is battery life - but you already have that covered with your power bank.
I have yet to find a GPS device that has the functionality and ease if use of a phone.
First of all, it doesn't have to be a binary choice. The usefulness of my GPS unit is significantly enhanced by my phone and my phone is better placed to do what I need it to do by using my unit.
Ease of use is a perfectly valid point to make a decision. However, for me, accuracy and dependability trump that. I recall my phone telling me I was in Belgium when I was across the bay in the Netherlands. In urban areas, my phone is frequently not accurate enough quickly enough. My GPS is, with exceptions like places in Monchau, Germany and some extreme hill towns where streets can be like stories of a building.
I've also used my phone daily to plot routes (and change them on the fly) for pretty long stretches. A big part of "ease of use" is familiarity.
Functionality is another, but in fairness, there are few things that are truly multifunctional. I use a number of apps on my phone but I don't trust them 100%. Google Translate can get you in a lot of trouble at times.
Speaking of functionality, my unit functions irrespective of internet connectivity - not many phone navigation apps do and the ones that do normally require an investment of time and energy in advance.
I've been playing with the CycleTravel app (phone) on and off since August. The first problem I had was heat - my phone kept switching off while my GPS continued as normal.
The second has been glare and rain - both interfering with the display - not an issue with the GPS.
Nothing against CT, at all - purely phone issues -, but those are the exact conditions that having a reliable method of seeing an alternative to the plan would be most welcome.
I appreciate that my kind of touring isn't everyone's cup of tea but since I got my unit I've come to love it's recording ability. Each day, easily married to my photos recorded for posterity.
Your phone does the job better possibly making any purchase a big disappointment.
Not all units work the same way and there are many people who are very unhappy with their units. I'd be pretty confident that a big reason for that is people buying the wrong unit for how they want to use it. I love mine and getting it gave me the confidence to spread my wings further - but it was my second unit - the first was an abomination.
I've seen a complaint from a guy who used his unit to plot a daily route for a 3 month European tour, not something I'd advise anyone to do (if for no other reason we have to be outside to get the unit to work in that fashion) and one of the funniest was a shouty rant against a dedicated bike unit because it wouldn't work properly hiking.