A really good unit for this purpose is the Garmin 276C. It has both
street navigation capability as well as compatiblity with Garmin Blue
Chart marine navigation software.

It can also be interfaced with a depthsounder module and give you depth
and temperature data if the sounder has that capability.

On 2006-03-23 22:03:35 -0500, "MarshallE" said:

Hi,

I find myself in the market for a new GPS...would be great if it was
portable...worked in car or boat..and be wonderful if it had depth sounder.

any opinions or ideas?
thanks