diff --git a/cmd/mtwebmapper/players.go b/cmd/mtwebmapper/players.go
index 227049e..947f5e5 100644
--- a/cmd/mtwebmapper/players.go
+++ b/cmd/mtwebmapper/players.go
@@ -2,8 +2,11 @@ package main
 
 import (
 	"bytes"
+	"encoding/json"
 	"html/template"
+	"log"
 	"net/http"
+	"sync"
 )
 
 var geoJSONTmpl = template.Must(template.New("geojson").Parse(
@@ -28,6 +31,7 @@ type players struct {
 	fifo string
 	wsf  *websocketForwarder
 	pls  []*player
+	mu   sync.RWMutex
 }
 
 func newPlayers(fifo string, wsf *websocketForwarder) *players {
@@ -49,5 +53,11 @@ func (ps *players) run() {
 }
 
 func (ps *players) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
-	// TODO: Implement me!
+	rw.Header().Set("Content-Type", "application/json")
+	ps.mu.RLock()
+	defer ps.mu.RUnlock()
+	encoder := json.NewEncoder(rw)
+	if err := encoder.Encode(ps.pls); err != nil {
+		log.Printf("error: sending JSON failed: %s\n", err)
+	}
 }