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No. St series from Raymarine are made for digital depth only, not fish finding and do not talk nmea. The only way to get that Garmin of yours to see depth would be to go from an ST40 nmea out to that garmin nmea in. Or purchase a nmea 0183 smart sensor and hook it to the garmin.
Check that the date shown on the unit is correct. If not, choose autolocate and allow about 10 minutes for the unit to find satellites. If this works, then the internal lithium ion battery is defective.
Any bluechart that has been preloaded on an SD card should work. Did you purchase your chip with the data preloaded or did you download it yourself? If you downloaded it yourself, try erasing the sd card, format it, then insert the blank card in the 420 and power it up. This somehow preps the chip for the data download. Then download the bluechart onto the chip and try again. There is some ambiguous wording in the download screen that makes it look like some kind of error, try the download anyway and most of the time it will work. After the download is complete it should list the bluechart software version on the screen along with some other software info. If the operating system software is not v2.5 or higher, you may need to download a software update first.
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