Your 185 will NOT take blue charts. You will also notice if you look at the Garmin website that to get the whole South coast of the Uk you would neeed to but quite a few maps, v.expensive, hence my choice of BlueChart. Don't forget IF you upgrade to a BlueChart unit they will give you a 25% discount, they are trying to get people to move from G-charts to BlueChart.
For Data cable see this link :-
For software udate see this link :-
(There are not many updates on the 185, the latest is from 4.03 to 4.05, check in system on the unit to see what version you have, you can do it via the menu feature.)
To update the unit is very easy, I have just updated my e-map and 176 ubits. One problem however is that the data cable comes with a 9 pin connecter (like for a joy stick on the PC), NOT USB. My computer is modern and has no 9 pin port
I had to pay about £39 for a Garmin 9 pin to USB converter cable, this cable is a load of nonsense, and even Garmin agree (USA help desk last night) that it only works occassionally, this is to do with data transfer speeds. Garmin's data transfers at a slow rate and cannot keep up with USB speed. In the end I had to use my sons laptop with the 9 pin port to update them. I will be speaking to Garmin about this as I have wasted £39. The answer is to get a Garmin chip reader that is USB, this enables you to take the chip out of the unit and put it into the reader unit attached to your PC and download data from there, then put it back in the GPS, it may be difficult however to use this to update the operating system on the unit.
It is very easy to update the system following the instructions, if anyone wants to try my USB adapter let me know. To find out if there is an update for your unit look under products, select yours, and when the page comes up look at the left column under software updates, it will tell you what has been updated. You need to look at the system details in your unit via menu to get info on your present software details.
For info, if you have Microsoft Autoroute Express on your PC or one of Garmins MapSource products, when you have the data cable attached and the GPS on, it will give you live details of where you are on the maps on the PC via the GPS. A bit difficult walking down the road with a generator and your desktop, but will still work with a laptop!
If you have any problems PM me.