GPSMAP® 238 Sounder

Part Number: 010-00250-10


We know you don't have extra space on your boat, so we packed a ton of features into this combination chartplotter/sounder unit. The GPSMAP 238 is a dual-frequency sounder that features exceptional resolution, a fast redraw rate, and split-screen capability so you can view your position and sounder information at the same time. This unit is WAAS capable for greater accuracy, and it has a built-in worldwide basemap with coastline detail, U.S. tide data, and inland features. The GPSMAP 238 also accepts optional data cards with Garmin's BlueChart® marine cartography for additional detail, and is fully compatible with many of our MapSource® products.

WAAS enabled BlueChart compatible


PDF Download detailed specs

Physical & Performance

Physical dimensions 7.7" x 7.5" x 2.6" (19.6 x 19.1 x 6.6 cm)
Display size, WxH 7.1" diagonal
Display resolution, WxH 360 x 240 pixels
Display type 10-level grayscale FSTN LCD
Weight 1.7 lbs.
Antenna External only
NMEA 0183 compatible
Power consumption 8 W max at 13.8 vDC
Mounting options Bail or Flush
Garmin Marine Network™ ports None

Maps & Memory

Preloaded maps None
Accepts data cards 1 Garmin Data Card
Waypoints 3,000
Routes 50

Chartplotter Features

Garmin Sonar compatible
Supports DSC (displays position data from DSC-capable VHF radio)
Tide tables

Sonar Features & Specifications

Dual-frequency (50/200 kHz) sonar capable
Frequencies supported 50/200 kHz
Transmit power 500 W (RMS); 4,000 W (Peak to Peak)
Maximum depth 1,500 ft.
Bottom lock (shows return from the bottom up)
Water temperature log and graph


NMEA 0183 input ports 2
NMEA 0183 output ports 2
Video input ports None
Video output ports None

In the Box

  • GPSMAP 238 Sounder
  • Basemap: Worldwide Marine
  • Bail mount
  • Remote antenna
  • Power/data cable
  • Protective front cover
  • Owner's manual
  • Quick reference guide


Maps for New Regions

Need maps for other regions? See all maps that are compatible with this device.

Need a map update?

Update the maps that came with your device for the best navigation experience.

Check for Updates