The Garmin c550 is my first and only sat nav and I have no gripes with it I think its a decent bit of kit, I cannot think of any extra features you would need to have in a sat nav system.

It has security features so when you turn it on you enter your pin if you forget it then it will unlock when you reach your secure destination which you set when you first use the device. I have mine set for a friends house rather than my home as I figured if my car gets stolen they are likely to have my car keys and house keys so at least if I get completely robbed the sat nav will be useless to them!

You can insert a SD memory card and upload your own music to the device.

I've never had a problem with the charge running out and it comes with a handy cigarette lighter charger so you can charge whilst on the move.

You can update maps of the website which I clearly need to do as I have taped in for the closest petrol station in the past and been led to 2 which were closed down and now blocks of flats before finding one that existed.

It also doubles up as bluetooth so you can make and receive calls through it which I think is fantastic I did not realise it did this and thought I was going to have to fork out more for a seperate piece of kit for this.

You can change the voice to male/female different accents and even have it set in another language which is useful if English is not your first language

It has a find feature where you can search for shopping malls, petrol stations, golf clubs, restaurants etc

I've never had a problem with the directions it has given me they are always accurate.

It also beeps at you when you are close to a speed camera which is particuarly useful when you are in an area that you are not familiar with, however I do not think it picks up mobile cameras I have driven past a speed trap once since using this and it did not pick it up but then I am not sure if other units would either.

The actual sat nav is quite bulky compared to other designs I have seen but I would not say this is a bad point as its firstly not something you really carry around and secondly makes it less appealing to thieves.

Here are some other stats:
http://www.google.co.uk/products/catalog? hl=en&source=hp&q=garmin+c550&um=1& ;ie=UTF-8&cid=4293621255635964007&ei=YU1xS _G_ EdS5jAfa7Iy8Cw&sa=X&oi=product_catalog_res ult&ct=result&resnum =1&ved=0CBQQ8wIwAA&os=tech-specs

I would definitely reccommend this.

Currently available from satnaveasy for £58.75 and Greatdigitalart £59.94