I lose SOG whenever I select a waypoint to go to

I never got this problem resolved. I lose SOG whenever I select a waypoint to go to. Here is some additional detail on my equipment / system.​

E7
P70 Display
EV-1 Course Computer
ACU 100 Acuator
TackTick
GPS Source: Choice of NMEA 0183 (0) or Internal
GPS. Internal GPS is currently
selected
GPS Datum Source Internal
Heading
Source - was NMEA 0183 (0), but I just changed it to EV-1 Course Computer
Depth source: NMEA 0183 (0)
Speed source: NMEA 0183 (0)
Wind: NMEA 0183 (0)
Internal GPS: On
NMEA Output - Default settings
NMEA Input Port 1: 38400 - sending and receiving data
NMEA Input Port 2: 38400 -
not sending or receiving anything