Waterproof case for Garmin 3.5 to make Nuvi 500 alternative?

I like the concept of the Nuvi 500. It is waterproof
and rugged and made for car use, walking use,
geocaching....

However I just cant afford one right now. Does there
exist another Nuvi with same firmware and features such
that I could put in say an Otterbox container to make
it waterproof??

the issue would be - waterproof while using.... kayak, canoe, etc
vs just tossing into a Pelican box or whatever when done.

waterproof while using

maybe a see thru dry bag?

but what cheaper nuvi model has same feature set as
nuvi 500?

hmmm - a small Ziplock bag ?

On Wed, 17 Feb 2010 15:05:53 -0600, ps56k wrote:

Better than nothing, but those tend to aquire pinholes when bumped
between hard objects. A tougher bag is recommendable, but it's your
gizmo, not mine.

--
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Wars lead to suffering. Advocacy is the first step on the road to the
kill-file.
                         -- Joe Zeff in the Monastery