[2 Bit Hook'R]

I have one one the boat, it runs through a Garmin 3010 UNIT. I have had it for 3 years and would not leave home with out it. SST can varie throughout the day, water is always moving in and out, i notice that the temp. lines are close, but they can vary with in a few degrees during the day. I use it as a referance while I am out. I have noticed that different units produce the information in different ways. xm is compatable with other units other then garmin. NICE to see them coming when your 50 miles off the beach! also look into sirus, they released a program last year at the miami boat show.