Anyone know of a good multi-purpose Control Head GPS/FIshinder, of modest cost, that can support transfer of routes and waypoints between my Maptech software and unit using a serial or USB hookup?

I love having Maptech Routes uploaded to my Garmin handheld GPS, but with the loss of my transducer/depthfinder, I want to upgrade to a fishfinder. A single fishfinder Control Head with internal antenna, that would also support use of Maptech Routes from my Maptech chart waypoints would be ideal.