Gpsmap 182c
My 182C developed the same problem. It appears to be a problem with reading data from the card. When I power up the unit, sometimes it will display "Reading Card" for a long time and no data will be read. I've found that if I open the latch and push in on the card as I press the power button, it will only then display the number of maps loaded. Sometimes less than other times. Most times a lot of data is not loaded from the card causing the problem frankcps describes and other problems, such as no data for tide stations, anchorage, etc. I tried cleaning the contacts on the data card & where it plugs in, but still continue to have the problem.
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