I'm looking for a fish finder to be used for fishing boat, it needs to be:
-portable and very easy to install and remove(in a matter of a few minutes) as I intend to use it when no fish finder is
available on chartered boat
-needs no drilling to install on boat(owners will refuse)
-Suitable and precise for depths up to 500 ft
-not expensive(100-200 USD budget)
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i think your budget is gonna be the killer - my garmin can do all this but just the unit was $500 when it was new (they are cheaper now im sure) and then i would probably rig a sea-sucker (for the transom) with the sounder attached with a safety strap. something like that.
http://www.boatfishfinder.com/tag/portable/