To clear up some confusion Tmotten-
You cannot read a PDF on the 600- just store it
You can associate an image to a waypoint- it has to be loaded manually via the PC link.
The advantage of the unit with the camera is that you can do all that without a pc- as in mark the spot and take a photo it it and link them up. It can be useful but if I need a photo I can always take one with my proper camera and do this later- it's all about personal choice!
The unit will speak to you too - then again, I prefer not to be nagged

and to receive guidance via the screen. For the same reason I do not use bluetooth - my helmet is either a place of peace and quiet or enjoys a little music from my ipod at times- I don't like 'combi' tools much as often one will fail -
Once you connect the 600 TO the PC, the pc reacts as if it is a new external hard drive.
You can cut/copy/paste files to and from your unit.
The file format for the map in the 600's
internal memory is a
GMAPPROM image and
you can ONLY have one of those.
However, on the micro SD card, you can have as many
GMAPSUPP images as you like-
(*)
Just be sure to have only one gmapsupp, the next must be
(*) gmapsupp1, gmapsupp2 etc etc for the unit to be able to see them as maps.
You can give the individual files other names but the unit will ignore those (then rename them with a pc or smart-phone when you need them- personally speaking, I can't see the point as that's another job to do on the move and I don't carry a notebook)
When powered up, you can chose in the 600, to 'Enable' or 'Disable' any
gmapsupp images (or the gmapprom for that matter) that you need/don't need at that particular time.
Remember NOT to have two maps enabled for the same area- else...
I bought my unit with GB discoverer to see the quality of the topographic maps and display and it is fabulous, crisp and clear and it routes too!.
The unit comes pre-loaded with a world base map too.
TMotten- As belt-and-braces- y
ou can copy a 'spare' img file onto a another micro sd card (don't back-up as the back-up software could write some weird stuff on the file- I have tried with OSM maps and it is fine.
This only works with free maps- If you have bought licenced maps, you can make another copy on an SD card in case one card fails -but it will only work in your unit.
Hope this helps. The alarm clock turned the unit on for me this morning and was bang...on time

!!
The calender function is very handy-
The Way-Point Manager enables you to enter a saved way-point and add details such as a postal address/phone number etc. via a screen keypad.
Having used the display (brightness user adjustable) I am impressed at the clarity of this screen both in bright sunlight and in the dark-
The hard mount has not arrived yet so am 'testing' this by shank and pony!
any other questions- do feel free to ask (except "can I have yours?"!! as that's a resounding 'no' !!!)