Just purchased a USB dongle from Etsy with the Navisys GR-701W that includes a ppi signal. It works well w/ my odroid on ubuntu and my laptop w/ fedora 28. GPSD and NTP set up...working well. Creates a usb-serial (ttyUSB*) device.
HOWEVER -- I noted that cgps utility looks good (valid output...takes 5-10 seconds for a fix)... but within kstars / ekos / indi... I do not get the right longitude. I get 360- <my longitude...of -77 degrees). Instead of -77, I get 283. Any ideas how to fix this?