and thanks to the help I recieved in this forum I have narrowed it down to the Garmin 152. (don't really need all of the chartplotting features, and expenses, of the others) One question....does the 152 with the internal antenna have an external connection for an external antenna also. I want to be able to mount it at the nav station and have the option to move it to the helm. I cannot find specifications for internal and external models anywhere, just a generic 152 manual on the Garmin site. Thanks all!