fix compiler issues

src/types/Inbound.cpp

@@ -280,9 +280,9 @@ void Inbound::predictETA(const EuroScopePlugIn::CRadarTarget& target, const Euro
     /* get the ground speed */
     Velocity groundspeed;
     if (0 == target.GetGS())
-        groundspeed = static_cast<double>(target.GetPosition().GetReportedGS()) * knot;
+        groundspeed = static_cast<float>(target.GetPosition().GetReportedGS()) * knot;
     else
-        groundspeed = static_cast<double>(target.GetGS()) * knot;
+        groundspeed = static_cast<float>(target.GetGS()) * knot;
 
     const auto& destination = gsl::at(this->m_arrivalRoute, this->m_nextStarWaypoint);
     Length distanceToNextWaypoint = 0_m;