So I put the boat in the water today in Whittier and about 5 minutes out of the harbor the old (2001 garmin 2010) works intermittently, no signal from antenna, and it's hard wired into the data/power cable. Also the depth/contour lines don't show but I have a blue chart card that says "anchorage to Juneau". It shows land, rocks, the boats position when it wants to but not the depth lines I need.
Sooooo to west marine and I have a choice in a garmin 740s plotter/sounder and a echo map 70S , both priced about the same, with internal antennas.
The older 740 has an option for an external GPS antenna; the guy at west said he never heard of an internal GPS (as found on the 70s) not work well.
What do you guys think? I like the idea of no antenna and it seems it should work fine on a 28' aluminum Koffler with an aft facing windshield plus the newer style and capabilities of the 70s seem attractive. There's room on the dash as removing the 2010 will open up some spaces.
I already have a brand new furuno radar so really just need the GPS & sounder.