I have the GPS map 536 that is the freshwater version of the 546. The unit needs a SD card (Blue Water from Garmin) that has coastal maps for your area. Then it needs to be programed to maintain a minimum depth, boat draft, maximum rate of turn, and maximum course deviation. What the unit was doing was give you the direct line to your destination. I bought a power cable for about $20 and learned how to use the unit and all of the options while sitting at home with the full manual on my computer screen. That is much easier than trying to learn while on the water.
_________________ 2006 Sundowner 255, 5.7 GXi, 320 hp "Simply Irresistible"
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