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Garmin 478 help with APRS

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Is anyone out here using the garmin 478 with APRS???


I just bought the Garmin 478 chartploter. I have been able to interface it with my Kenwood THD7a for data ,,,, BUT....


I see the unit has a feature of DSC or Digital Selective Calling that is used by Mariners with 2 functions of distress calls and position reporting (APRS I would guess?) using a marine VHF radio.


The unit has a DSC tab that when in marine mode (verses automotive mode) and properly connected to a VHF radio you can receive and send data. recieved data will auto display on the unit.


My question is how can I interface my THD7a VHF radio to this feature, it will then create a call list of APRS data recieved.

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