Anyone recommend a decent external speaker for nuvi 360T?

[roadrunner69]

I just bought a new 360 and although an excellent bit of kit,
the lack of volume and clarity through the built-in speakers
make it unuseable in my works transits.
I have a C510 (with TTS hack) that is a ghettoblastingboombox
in comparison.

I don't really want to go the FM route as I want the radio on
as normal.
Any ideas?

Thanks

We see you’re using an ad-blocker. We’re fine with that and won’t stop you visiting the site.
Have you considered making a donation towards website running costs?.
Or you could disable your ad-blocker for this site. We think you’ll find our adverts are not overbearing!