Not sure of your needs, but if you have a sonar unit already, I would suggest that you go the radar/chartplotter route. I got a Raymarine unit for that very reason. Already had 2 nice sonar units, one with GPS built in, so I figured that the radar /chartplotter was the logical way to go. Just a suggestion.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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