Recommend a decent Sat Nav?

[Gingernutz]

I have a cheap waterproof case from amazon like this one (you can use the screen through it)

and a cheap satnav from ebuyer like this one

I connect the sat nav  headphone socket to my autocom
For power I bought a setup to connect direct to the bike battery  like this one without the ciggie adapters


Satnav = £40 + case £13 + power £10 + extension for headphones £3 = bargain.
I run tomtom maps but the ones on it were fine