diff --git a/Makefile b/Makefile
index ffcf525..6738034 100644
--- a/Makefile
+++ b/Makefile
@@ -15,7 +15,7 @@ SIMPLESOCKETS=ext/powerblog/ext/simplesocket/swrappers.o ext/powerblog/ext/simpl
 navparse: navparse.o ext/fmt-5.2.1/src/format.o $(H2OPP) $(SIMPLESOCKETS) minicurl.o ubx.o bits.o navmon.pb.o gps.o
 	$(CXX) -std=gnu++17 $^ -o $@ -pthread -L/usr/local/lib -lh2o-evloop -lssl -lcrypto -lz  -lcurl -lprotobuf  # -lwslay
 
-navdump: navdump.o ext/fmt-5.2.1/src/format.o bits.o navmon.pb.o 
+navdump: navdump.o ext/fmt-5.2.1/src/format.o bits.o navmon.pb.o gps.o
 	$(CXX) -std=gnu++17 $^ -o $@ -pthread  -lprotobuf
 
 
diff --git a/ephemeris.hh b/ephemeris.hh
index fd207cd..7f38e2a 100644
--- a/ephemeris.hh
+++ b/ephemeris.hh
@@ -1,13 +1,14 @@
 #pragma once
 #include "minivec.hh"
 
-void getCoordinates(int wn, double tow, const auto& iod, Point* p, bool quiet=true)
+template<typename T>
+void getCoordinates(int wn, double tow, T& iod, Point* p, bool quiet=true)
 {
   using namespace std;
   // here goes
 
-  constexpr double mu = 3.986004418 * pow(10.0, 14.0);
-  constexpr double omegaE = 7.2921151467 * pow(10.0, -5);
+  const double mu = 3.986004418 * pow(10.0, 14.0);
+  const double omegaE = 7.2921151467 * pow(10.0, -5);
   
   double sqrtA = 1.0*iod.sqrtA / (1ULL<<19);
   double deltan = M_PI * 1.0*iod.deltan / (1LL<<43);
diff --git a/navdump.cc b/navdump.cc
index 78154fb..e49a753 100644
--- a/navdump.cc
+++ b/navdump.cc
@@ -22,7 +22,7 @@ using namespace std;
 
 static std::string humanTime(time_t t)
 {
-  struct tm tm;
+  struct tm tm={0};
   gmtime_r(&t, &tm);
 
   char buffer[80];
@@ -67,7 +67,10 @@ int main(int argc, char** argv)
       uint8_t page;
       int frame=parseGPSMessage(cond, gs, &page);
       cout<<"GPS "<<sv<<": ";
-      if(frame == 2) {
+      if(frame == 1) {
+        cout << "gpshealth = "<<(int)gs.gpshealth;
+      }
+      else if(frame == 2) {
         cout << "t0e = "<<gs.iods.begin()->second.t0e;
       }
       cout<<"\n";