diff --git a/revid/geovision.go b/revid/geovision.go
index bc24c478..f801dc50 100644
--- a/revid/geovision.go
+++ b/revid/geovision.go
@@ -24,24 +24,105 @@ LICENSE
 
 package revid
 
-import ()
+import (
+	"errors"
+	"fmt"
 
-type GeoVision struct {}
+	"bitbucket.org/ausocean/av/codec/codecutil"
+	"bitbucket.org/ausocean/av/input/gvctrl"
+)
+
+const (
+	gvDefaultCameraIP   = "192.168.1.50"
+	gvDefaultCodec      = codecutil.H264
+	gvDefaultHeight     = 720
+	gvDefaultFrameRate  = 25
+	gvDefaultBitrate    = 400
+	gvDefaultVBRBitrate = 400
+	gvDefaultMinFrames  = 100
+	gvDefaultVBRQuality = "standard"
+)
+
+var (
+	errGVBadCameraIP   = errors.New("camera IP bad or unset, defaulting")
+	errGVBadCodec      = errors.New("codec bad or unset, defaulting")
+	errGVBadFrameRate  = errors.New("frame rate bad or unset, defaulting")
+	errGVBadBitrate    = errors.New("bitrate bad or unset, defaulting")
+	errGVBadVBRQuality = errors.New("VBR quality bad or unset, defaulting")
+	errGVBadHeight     = errors.New("height bad or unset, defaulting")
+	errGVBadMinFrames  = errors.New("min frames bad or unset, defaulting")
+)
+
+type GeoVision struct {
+	cfg Config
+}
 
 func (g *GeoVision) Set(c Config) error {
-  err := gvctrl.Set(
-		r.config.CameraIP,
-		gvctrl.Channel(r.config.CameraChan),
+	var errs multiError
+	if c.CameraIP == "" {
+		errs = append(errs, errGVBadCameraIP)
+		c.CameraIP = gvDefaultCameraIP
+	}
+
+	switch c.InputCodec {
+	case codecutil.H264, codecutil.H265, codecutil.MJPEG:
+	default:
+		errs = append(errs, errGVBadCodec)
+		c.InputCodec = gvDefaultCodec
+	}
+
+	if c.Height <= 0 {
+		errs = append(errs, errGVBadHeight)
+		c.Height = gvDefaultHeight
+	}
+
+	if c.FrameRate <= 0 {
+		errs = append(errs, errGVBadFrameRate)
+		c.FrameRate = gvDefaultFrameRate
+	}
+
+	if c.Bitrate <= 0 {
+		errs = append(errs, errGVBadBitrate)
+		c.Bitrate = gvDefaultBitrate
+	}
+
+	if c.MinFrames <= 0 {
+		errs = append(errs, errGVBadMinFrames)
+		c.MinFrames = gvDefaultMinFrames
+	}
+
+	switch c.VBRQuality {
+	case qualityStandard, qualityFair, qualityGood, qualityGreat, qualityExcellent:
+	default:
+		errs = append(errs, errGVBadVBRQuality)
+		c.VBRQuality = defaultVBRQuality
+	}
+
+	if c.VBRBitrate <= 0 {
+		errs = append(errs, errGVBadVBRQuality)
+		c.VBRBitrate = defaultVBRBitrate
+	}
+
+	if c.CameraChan != 1 && c.CameraChan != 2 {
+		errs = append(errs, errGVBadVBRQuality)
+		c.CameraChan = defaultCameraChan
+	}
+
+	g.cfg = c
+
+	err := gvctrl.Set(
+		g.cfg.CameraIP,
+		gvctrl.Channel(g.cfg.CameraChan),
 		gvctrl.CodecOut(
 			map[uint8]gvctrl.Codec{
 				codecutil.H264:  gvctrl.CodecH264,
 				codecutil.H265:  gvctrl.CodecH265,
 				codecutil.MJPEG: gvctrl.CodecMJPEG,
-			}[r.config.InputCodec],
+			}[g.cfg.InputCodec],
 		),
-		gvctrl.Height(int(r.config.Height)),
-		gvctrl.FrameRate(int(r.config.FrameRate)),
-		gvctrl.VariableBitrate(r.config.VBR),
+		gvctrl.Height(int(g.cfg.Height)),
+		gvctrl.FrameRate(int(g.cfg.FrameRate)),
+		gvctrl.VariableBitrate(g.cfg.VBR),
 		gvctrl.VBRQuality(
 			map[quality]gvctrl.Quality{
 				qualityStandard:  gvctrl.QualityStandard,
@@ -49,14 +130,14 @@ func (g *GeoVision) Set(c Config) error {
 				qualityGood:      gvctrl.QualityGood,
 				qualityGreat:     gvctrl.QualityGreat,
 				qualityExcellent: gvctrl.QualityExcellent,
-			}[r.config.VBRQuality],
+			}[g.cfg.VBRQuality],
 		),
-		gvctrl.VBRBitrate(r.config.VBRBitrate),
-		gvctrl.CBRBitrate(int(r.config.Bitrate)),
-		gvctrl.Refresh(float64(r.config.MinFrames)/float64(r.config.FrameRate)),
+		gvctrl.VBRBitrate(g.cfg.VBRBitrate),
+		gvctrl.CBRBitrate(int(g.cfg.Bitrate)),
+		gvctrl.Refresh(float64(g.cfg.MinFrames)/float64(g.cfg.FrameRate)),
 	)
 	if err != nil {
-		return nil, fmt.Errorf("could not set IPCamera settings: %w", err)
+		return fmt.Errorf("could not set IPCamera settings: %w", err)
 	}
-  return nil
+	return multiError(errs)
 }