Hi hollywood,
what boat do you go out fishing in? The answer you give might make a difference to what people will advise you on.
As sand tiger said what do you think you will gain from either portable units?
I have a small inflatable dinghy that has a humminbird wide100 fishfinder on it and I use this to see how deep the water is and to try and find fish holding features. It very rarely shows fish but we catch loads.
I also have a slightly better garmin ff140 on our boat. That does show up a string of mackerel feathers but again I use it more to see features on the seabed and the depth of water I am fishing in.
I also have a garmin gps on the boat and that does exactly what it says on the tin. These are all fixed units though and my personal experience with portable fishfinders is you get what you pay for. I have no experience of portable gps units.
A friend of mine had a fishfinder on his boat and all he did was look at the screen, wait for a blip to appear then drop his line down (so I am told). He never caught anything :whistling
Malcolm.