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Message: <blockquote data-quote="Team Colibri" data-source="post: 333556" data-attributes="member: 11574">Well, in theory using the GPS and the fishfinder you have can be used, taking down position and depth and putting it into excel as what is known as a CSV-file. CSV might sound technical, but it's actually just a bunch of numbers separarated by commas. (CSV = Comma Separate Value). So writing down the Depth and exact position and then making a map is possible. The challenge comes in the hours needed.... The map I posted a pic of, is made up of more then 200.000 depthreadings, so you need to take down a lot of those notes unless it is a very smal lake or it has a very "predictable" bottom/ depth. But then again, if the bottom is the same al around the lake, there is no need for a map? I guess the bottom line is, that for making high-quality depthcharts, you need a combo-unit in your boat. From Lowrance, the cheapest unit that fits the bill is the Elite-5 HDI at 499,- USD with a transeducer. Not sure what the cheapest Garmin unit would be, but I'm curious by nature, so I just emailed them to find out.</blockquote>