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In a two-on-one chartplotter/sounder shootout, a pair of Si-Tex units takes on a single Garmin combo machine.

If you’ve got the space, consider Si-Tex’s Dynamic Duo (center and right)— a plotter and sounder with separate screens that sells for about the same as the Garmin 188C (left), which is perfect for boats with limited room at the helm.

Chartplotter/sounder combo units take up less console space and usually cost less than separate pieces. But if the combo breaks down, you’ve lost two important instruments at once. Not good. Citing this Achilles heel, Si-Tex is pushing a two-unit system sold as “the Dynamic Duo” to give the consumer “the convenience and safety of two dedicated products at the low price of a combo unit.” Si-Tex has a compelling pitch, so we decided to test the product. And a good way to evaluate the Dynamic Duo—which consists of the Si-Tex ColorMax 6 chartplotter and CVS-106L sounder—was to match it against a proven combo unit from Garmin—the 188C. …