i have to agree with Theo
save your pennys and get a good quality one
if you buy a cheaper one you will soon be wishing you had spent a little more money and got one with more features,better screen, better resolution
i started off with a cheapo garmin which was upgraded a few months later to a entry level sounder which was then upgraded to a gps/finder combo
all this within a few months
best just to wait and get a good one