None of this is at all helpful to the OP, not least as heās already bought his Navigator V.
1. Congratulations on now owning a Nav V GPS device, an excellent aid to getting you from A to B or even A to Z, via all the letters in between, along either roads of your choosing or roads that the device itself has selected for you.
2. You cannot load appās onto the device per-se. What you can do is link the device to your phone (which can run many applications) and / or to your bike * and / or to any Bluetooth earphones you may own and / or to any associated bike-to-bike capability those earphones may have.
3. Which applications work best on your phone? Is really a question (as is the whole topic) for the GPS section or even the pub section. This section is exclusively for dealing with the technical aspects of water cooled GS motorcycles and, most importantly, which gloves match them best.
4. What sized SD card? Again, a question for the GPS section, which you have now - with some tongue in cheek prompting - discovered, I see. I also see that this question was then answered accurately in very short order. Ask your applications question there and youāll get some more good answers. All you are getting here is, āYou shouldnāt have bought a Nav V, mateā (itās a bit late for that) and heaps of conflicting advice on what you should have done instead.... oh..... and help with matching gloves. Not least, in the GPS section, one member (Berin, a strong user of assorted devices, on and off road) has conducted a whole heap of reviews of applications and different hardware, in the end concluding that it was and is still very difficult to beat a proper GPS device.
https://www.ukgser.com/forums/showt...ew-of-different-phone-apps-and-Garmin-devices
You now own a proper GPS device; all you have to do now is learn how to use it fully and properly. The GPS section will help you with that, trust me.
As a bonus, the GPS section also has sub-sections on the challenges many bods face getting their all singing, all dancing, phone and mixed applications (like Kurviger, MyRoute, Scenic and the like) to perform just how they imagine (and have been told) they should. It is often not the plain sailing voyage some think
bods think it is.
* WC owners love this, as the device tells them all sorts of awesome cool stuff. For example, the VIN number, how often they have applied the brakes and the current (real time) voltage the alternator is kicking out. This is vital stuff, trust me. All there at the touch of a button, as you hoon to Tesco.