Screen mirroring to a tv. It's pretty awesome but uses a lot of power.

Ah OK.
Via a HDMI cable, bluetooth or wifi - any or all of them I guess?

No it's wireless through the Wi-Fi network. Hence the power

Garmin 590LM
 

There's a review of one of the latest garmin models in another thread.

It's within "equipment reviews" and I thought it worth bringing a link into here for the "pros and cons argument" contained in the title of this thread.
http://www.horizonsunlimited.com/hub...m-review-82727

AGM Stone first impressions
 

So, I've put my money on the counter and bought the AGM Stone phone shown in the link above (for just less than £100 via auction on UK ebay).

It's early days but first impressions are excellent; the spec in the link above gives a load of detail, including some statements that I don't fully understand.
No matter, this thing is as fast as it can be - switch it on and the damn thing just works; maps come up as fast as I can press the buttons.

Incidentally, behind the back cover shown in the linked information (which is screwed into place) there is an additional cover with a rubber seal which protects the innards from H2O, dust etc.
I don't aim to deliberately test it up to the IP67 specification but it appears well capable of resisting rain water.

Looks nice. Keen to find out about how it deals with prolonged periods of sun.

It's not particularly warm in the hand, running a load of software.

Like all screens there is some reflection when outdoors but it's not bad in bright sunshine - I suspect that the resolution of the screen pixels helps with that.

Apart from hand held use, so far I have used it set up in a 4 wheeler; directly exposed to the sun behind a windshield the case was still not especially warm to the touch while running the GPS mode and a mapping app.

That was the main problem with my old Nokia N80. Back then there weren't really motorcycle GPS about, so it was kept in the map pocket of my tankbag.

The phone was well known for being slow due to a lack of memory, but it would heat up and just get slower until it crashed. Still it got me 5,500 miles to the black sea and back.

I didn't express that sentence too well: the phone is not warm at all when hand held - it is at whatever the ambient temperature happens to be.
There again, I have warm hands!!

I guess it is down to the powerful processor (see the specs for that detail) which should be able to run a lot of software therefore; I am not in to gaming and all that type of thing so this specification does what I want.

Most phones will accept an internal sd card of course for app storage purposes.
I'm using a 16 Gb card in the Stone which accepts upto 32 Gb max. IIRC.

I've already forgotten the built in memory spec for the AGM Stone (perhaps 4 Gb, maybe 8?) but it will be in the earlier link; that doesn't seem to be a limiting factor for the Stone.
I've yet to find a limiting factor of the Stone for the purposes discussed in this thread.

ps
It's 8 Gb of ROM with 1 GB of built in RAM

Not so much a limiting factor, but it does feel quite heavy to the hand; comparing it today on some scales the AGM Stone weighed in at 248 gms while a Nexus 6 in a plastic protective case weighed 217 gms.

My "wanted" smart phone specks...

Need;
micro SD card at least 32Gb
WiFi
USB GTO connection
Small enough to fit is a shirt pocket
Availability of additional protective silicon case
Availability of additional protective gorilla glass
4 band 3G
At least 8 Gb internal memory
MP3 player
Battery life of at least 1 day!!!

Like;
4 band 4G
cheap

Present phone Samsung S4 mini dous. Misses on the USB GTO, has USB and might be routeable for the GTO function.

GPS specks?
Need;
Run 'my' Garmin maps
Battery life of at least 1 day on internal batteries
Automatic swapping between internal and external power
Viewable in bright sunlight!
Able to create a route, and use it.
micro sd card for memory of at least 2 Gb
Tracks automatically go to the memory card, date stamped and saved each day.
Easy swapping between maps
External power, say, 5 volts to 36 volts.

Like;
Run raster maps

Present GPS Garmin 60Cx .. misses ... not great in bright sunlight, no raster maps. External power limits (I'd have to look those up)?

For the software aspect, there are some interesting reviews of OSMAnd, Orux and Soviet Military Maps in this thread/post:-
http://www.horizonsunlimited.com/hub...vigation-81406

Here gone there
 

It wasn't even in my list of some 10 months ago, but I think "Here" has been discussed in here since last Oct.
Anyway, briefly, Nokia pulled out of manufacturing mobile phones having failed to foresee what was happening with smart phones, eventually licensing Microsoft to use the Nokia name on their Lumia branded hardware - that's the potted history for the hardware side of things.

Nokia went on to concentrate on producing maps with the brand "Here".
Now they have sold out that whole area of activity to the German car manufacturing industry:- German luxury automakers purchase Nokia’s Here mapping services
For a couple of billion of some currency or other.
The reasoning for the purchase is given, briefly, in the link. Not so clear is why Nokia wanted/needed to sell.

In any case, I guess the free app for Here will be available for a bit longer but I have lost interest in dabbling with Here.
I remain grateful for the existance of OSM! bier

The AGM Stone that I got lasts about 6 hours while running with no external power attached.
I think it would go a bit longer because it comes up with a "15% battery remaining" warning after said 6 hours of running navigation software while set in aircraft mode.