Besides the Furuno GT-8036 breakout board, I just did a layout for a board
that converts the pinouts of Motorola M12+ compatible receivers to a 0.1" 9-pin
header that (mostly) matches the Adafruit Ultimate GPS. The Adafruit ENABLE
pin is repurposed as a DGPS RTCM corrections input and the Adafurit +3.3VREG
output pin is used to provide external antenna (5V) power... the board
defaults to use the 3.3V VCC power input for the antenna power. Contact me off
list if interested.
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