The Echomap 50s replaces my GPSMap 172c which died last year; I can use the transducer from my Echo 100 and eliminate the second unit.
Overall, the unit works very well. GPS performance seems much faster than the 172c. Speed readout is to 0.01kt below 10kt; gives you a good feeling when trimming the sails.
The basemap included with the unit is not very useful. Shop around for the best deal on map chips.
Two slots for map chips is good. We use the unit in a sailboat in Boston and also in a powerboat on the Adriatic in Croatia and would forget to bring the right chip when we traveled. Now I always have it.
It takes two button pushes to get to the map page. The old one went to the map page (if that's where you left it) when powered up. Seems more susceptible to turning itself off when voltage is low (like when starting the engine).
Overall, I am happy with the unit and the price I paid. Last but not least, Hodges Marine did a great job; got it the next day!
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