I am in the market for a new fish finder. ( Must be portable )<br /><br />I had a look at :<br /><br />1. Humminbird Matrix 20 Portable <br />2. Eagle FishEasy 2 Portable<br /><br />Any one use any of these or any other brands who could give some advice.<br /><br />Should I get single or dual frequency?<br /><br />I will use it mainly ( at night ) for targetting snapper in about 50 to 100 metres and occasionally for trolling.