I have a Lowrance HDS5, my friend has the Garmin 740s. His radar display overlays the chart. Mine needs the proprietary electronic compass
. (Read expensive). The one I have on the boat already does not meet the requirements. His is touch screen and very easy to use.
Mine is pretty good at "seeing" what is out there. I was able to find a kayak
on the ocean at about a mile and half out. Range is pretty good at about 15 miles or so. Real world use, clear night time looking for ships, land etc. while coming back from Catalina
. He had no complaints on the quality of his resolution. Both units use very low power
. Given a choice, I would go with the Garmin, I looked at the two different units for about 6 months before I made my decision, and it was very close.