diff --git a/cmd/rove/main.go b/cmd/rove/main.go
index 4e3a1d2..bd98d52 100644
--- a/cmd/rove/main.go
+++ b/cmd/rove/main.go
@@ -11,7 +11,6 @@ import (
 	"time"
 
 	"github.com/mdiluz/rove/cmd/rove/internal"
-	"github.com/mdiluz/rove/pkg/maths"
 	"github.com/mdiluz/rove/pkg/version"
 	"github.com/mdiluz/rove/proto/roveapi"
 	"golang.org/x/net/context"
@@ -124,6 +123,21 @@ func checkAccount(a Account) error {
 	return nil
 }
 
+// BearingFromString converts a string to a bearing
+func BearingFromString(s string) roveapi.Bearing {
+	switch s {
+	case "N":
+		return roveapi.Bearing_North
+	case "E":
+		return roveapi.Bearing_East
+	case "S":
+		return roveapi.Bearing_South
+	case "W":
+		return roveapi.Bearing_West
+	}
+	return roveapi.Bearing_BearingUnknown
+}
+
 // InnerMain wraps the main function so we can test it
 func InnerMain(command string, args ...string) error {
 
@@ -215,13 +229,15 @@ func InnerMain(command string, args ...string) error {
 				i++
 				if len(args) == i {
 					return fmt.Errorf("move command must be passed bearing")
-				} else if _, err := maths.BearingFromString(args[i]); err != nil {
-					return err
+				}
+				var b roveapi.Bearing
+				if b = BearingFromString(args[i]); b == roveapi.Bearing_BearingUnknown {
+					return fmt.Errorf("unrecognised bearing: %s", args[i])
 				}
 				commands = append(commands,
 					&roveapi.Command{
 						Command: roveapi.CommandType_move,
-						Data:    &roveapi.Command_Bearing{Bearing: args[i]},
+						Data:    &roveapi.Command_Bearing{Bearing: b},
 					},
 				)
 			case "broadcast":
diff --git a/pkg/rove/world.go b/pkg/rove/world.go
index a5ab05f..7c313ba 100644
--- a/pkg/rove/world.go
+++ b/pkg/rove/world.go
@@ -427,7 +427,7 @@ func (w *World) Enqueue(rover string, commands ...Command) error {
 		switch c.Command {
 		case roveapi.CommandType_move:
 			if c.Bearing == roveapi.Bearing_BearingUnknown {
-				return fmt.Errorf("bearing must be cardinal")
+				return fmt.Errorf("bearing must be valid")
 			}
 		case roveapi.CommandType_broadcast:
 			if len(c.Message) > 3 {