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Whether you're looking to enjoy a day out boating or you're after the one that got away, the Garmin GPSMAP 451s offers the brightest, sharpest graphics seen on a 4-inch screen.

Garmin GPSMAP 451s comes with a powerful digital sounder and has the option of connecting a dual-frequency transducer for clear illustration of depth contours, fish targets and structure whether you're fishing in freshwater or off the coast. Garmin GPSMAP 451s is preloaded with Garmin BlueChart g2 UK and Ireland mapping.

Garmin GPSMAP 451s is a compact chartplotter that features an ultra-bright 4-inch QVGA colour display along with an improved high-speed digital design for increased map drawing and panning speeds. It’s ready to go with an easy-to-use interface and a built-in, satellite-enhanced basemap preloaded with Garmin BlueChart g2 UK and Ireland marine charts. Garmin GPSMAP 451s also accepts BlueChart g2 Vision cards for added features and functionality such as high-resolution satellite imagery, Mariner’s and Fish Eye views and Auto Guidance technology.

Explore the Seas

Garmin GPSMAP 451s comes ready to go with preloaded marine charts for the UK and Ireland. For all other areas, the GPSMAP 451s has a worldwide basemap with satellite images in place of more traditional maps. The GPSMAP 451s also comes standard with a high-sensitivity GPS receiver for superior satellite tracking and quicker acquisition times. And with an SD card slot, it’s easy to add additional maps without connecting to a computer.

Add Sonar

The Garmin GPSMAP 451s is compatible with an optional dual-frequency transducer for clear illustration of depth contours, fish targets and structure whether you're fishing in freshwater or off the coast. It's also CANet compatible, so you can share sounder data with another chartplotter on your boat.

Add Extras with BlueChart g2 Vision

With the optional BlueChart g2 Vision SD card, you can add a whole new dimension of exceptional features to your chartplotter.

3D mariner's eye view or fish eye view provides you with a 3-dimensional perspective of chart information, both above the waterline and below it.

High-resolution satellite images and aerial photographs help you orient yourself in unfamiliar areas.

Auto Guidance technology searches through all relevant charts to create a route you can actually follow - one that avoids obstacles, shallow water, buoys and other obstructions.

Garmin GPSMAP 451s Features

4-inch bright colour QVGA display
Preloaded worldwide satellite imagery basemap
Preloaded Garmin BlueChart g2 UK and Ireland
Built-in GPS Antenna
Supports AIS and DSC
NMEA 2000 compliant
500w sounder, scans up to 1500ft (457m) depth*
Waterproof to IPX7
SD card slot allows upgrade to BlueChart g2 Vision cartography
1 Year manufacturers guarantee.

*with optional dual frequency transducer.

Garmin GPSMAP 451s Map Coverage

Garmin GPSMAP 451s is preloaded with Garmin BlueChart g2 UK and Ireland mapping (pictured right). For full colour aerial photos of ports, marinas, bridges, etc, true 3D-view "mariners eye" above-waterline imagery and "fish eye" 3D-view below-waterline imagery you will need to purchase BlueChart g2 Vision maps on microSD/SD card. If you require these maps, simply scroll down this webpage or telephone 0845 226 1738 (Mon-Fri 9am-5pm) to check availablilty and to place an order.

What's in the box? (when purchased from ActiveGPS.co.uk)

Garmin GPSMAP 451s
Preloaded Garmin BlueChart g2 UK and Ireland
Tilt/swivel Mount
Protective Front Cover
Power/Data Cable
Owner's Manual

Garmin BlueChart Maps

Garmin BlueChart g2 Vision UK and Ireland microSD,SD card - Garmin BlueChart g2 Vision UK and Ireland microSD,SD card. Get a fresh perspective when you take to the water with BlueChart g2 Vision With BlueChart g2 Vision data, you’ll get detailed marine cartography that provides convenient viewing of nautical content and other premium features.

Garmin BlueChart g2 Vision English Channel microSD,SD card - Garmin BlueChart g2 Vision English Channel microSD,SD card. Get a fresh perspective when you take to the water with BlueChart g2 Vision With BlueChart g2 Vision data, you’ll get detailed marine cartography that provides convenient viewing of nautical content and other premium features.

Garmin BlueChart g2 Vision The Solent and Channel Islands microSD,SD card - Garmin BlueChart g2 Vision The Solent and Channel Islands microSD,SD card. Get a fresh perspective when you take to the water with BlueChart g2 Vision With BlueChart g2 Vision data, you’ll get detailed marine cartography that provides convenient viewing of nautical content and other premium features.

Garmin GPSMAP 451s Technical Specification

Technology: GPS
Display: 4-inch QVGA display (240 x 320 pixels)
Battery: None
Waypoints/favourites/locations: 3,000
Routes: 100
Track Log: 10,000 points, 50 saved tracks
Basemap: Worldwide
NMEA input/output: NMEA 0183 compatible and NMEA 2000 certified
Built-in memory: None (cannot load maps to internal memory)
Data cards: SD card slot
Garmin radar compatible: No
Garmin sonar compatible: Yes
Waterproof: Yes, IPX7
Dimensions: Width - 145mm, Height - 127mm, Depth - 69mm
Weight: 590grams
Guarantee: 1-year
Garmin GPSMAP 451s manual

Manual requires Adobe Acrobat Reader
Download a free copy here.