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Garmin GPS 158i with and without GA 38 GPS/GLONASS Antenna

Product Codes: GAR158G and GAR158

Garmin GPS 158i is a budget chartplotter offering the basic capabilities of a chartplotter. It has a 5-inch screen which is greyscale LCD. There is also a compass and you can measure speed, distance and position. The system uses high-sensitivity GPS receiver making the device very accurate.

Included within the 158i is a preloaded worldwide basemap and access to tide tables. There are no further maps compatible with this system. You are limited to the basic functions of a chartplotter with this system. You can store 3,000 waypoints, 50 routes and 10000 track log points.

Garmin GPS 158i has been discontinued.

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Deliveries

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We offer FREE UK delivery on all orders of £50.00 or more, plus next working day and guaranteed Saturday delivery options. Click here for further info. All options also appear at the basket pages.

The Garmin GPS 158i is a budget chartplotter which offers a 5-inch diagonal, high contrast, greyscale LCD display. Included within the 158i is a preloaded worlwide basemap. It also has a high-sensitivity GPS receiver and internal GPS antenna. Plus you can connect an external GPS antenna using the BNC connector.

The GPS 158i includes compass and displays speed and position and can track you route and calculate the distance between waypoints. There is a 3D view along your journey plus receive vital information too which you can choose. You can also set the orientation of the map view by selecting between North-Up, Track-Up or Course-Up.

Tracking your position with the GPS158i is very accurate especially with the included High Sensitivity GPS receiver.

Garmin GPS 158i with GA 38 External GPS Antenna

You can choose to buy the GPS 158i on its own or buy the GPS 158i with the GA 38 external GPS antenna (as pictured right). When purchased with the GA 38 it is only £10.00 more than our regular price without this external antenna. You will get all the mounts needed for mounting the antenna including pole mount, surface mount and under-deck mount (for the underside of fibreglass decks).

Already own a GPS 158/158i and want to buy the GA 38 GPS/Glonass antenna? It's available along with a number of other genuine and compatible accessories here.

If you want a chartplotter that is more advanced than the budget 158i system then we recommend the Garmin GPSMAP 451. Unlike the Garmin 158i this system is touchscreen and accepts further mapping capabilities so you can get more information relating to your journey.

You can store 3,000 waypoints, 50 routes and 10000 track log points. This 158i is also NMEA 0183 compatible which will send position data to another device. Also included is tide tables. This device is also waterproof to IPX7 standards.

Garmin GPS 158i Features

‣5-inch gray scale screen (FSTN 4-level monochrome), 480 x 320 pixels
‣Option to change the size of data displayed
‣High-sensitivity, high-sensitivity GPS receiver
‣Internal GPS antenna with external BNC antenna connection
‣Tracklog: 3000 waypoints / 10,000 tracklog points / 50 saved tracks
‣Tide tables
‣One NMEA 0183 output
‣Voltage range: 10-36 Vdc input
‣Waterproof - IPX7 standards
‣1 Year manufacturers guarantee

Installation

Please refer to the Garmin GPS 158i manual.

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

Product GAR158G

‣Garmin GPS 158i
‣GA 38 GPS/GLONASS antenna kit
‣Tilt/Swivel quick release mount
‣Power cable
‣Hardware
‣Owners manual/Quick reference guide

Product Codes: GAR158

‣Garmin GPS 158i
‣Tilt/Swivel quick release mount
‣Power cable
‣Hardware
‣Owners manual/Quick reference guide

Garmin GPS 158i Accessories

Buy genuine accessories and spares for the Garmin GPS 158 here. All parts are genuine Garmin product and specifically designed for use with the GPS 158 and GPS 158i 5-inch marine chartplotter.

View all Garmin GPS 158i accessories

Garmin GPS 158i Questions and Answers

Question: Do you have a new 4 pin power cable for my Garmin 158i?

Answer:Yes, the 4 pin power cable for your Garmin 158i can be purchased here. You can view all Garmin GPS 158i accessories here.

Do you have a question about the Garmin GPS 158i? Submit your question via our contact page.

Garmin GPS 158i Technical Specification

‣Technology: GPS
‣Display: 5-inch FSTN 4-level monochrome greyscale LCD (480 x 320 pixels)
‣Battery life: None
‣Waypoints/favourites/locations: 3,000
‣Routes: 50
‣Track Log: 10,000 points
‣Basemap: Yes (worldwide basemap)
‣NMEA input/output: NMEA 0183
‣Built-in memory: 1Mb
‣Ability to add maps: No
‣Garmin radar compatible: No
‣Garmin sonar compatible: No
‣Waterproof: Yes, IPX7
‣Dimensions: Width - unknown, Height - unknown, Depth - unknown
‣Weight: unknown
‣Guarantee: 1-year
‣Garmin GPS 158i manual

Manual requires Adobe Acrobat Reader
Download a free copy here

This is a sophisticated electronic device. It is important to read, understand, and follow the instructions provided in the user manual (usually available via the 'manual' link above). To ensure optimal performance, you will need internet access and should regularly download and install firmware and software updates as recommended by the manufacturer. Like all GPS devices, it requires a clear view of the sky to connect with satellites, so be aware that certain vehicle glass or enclosures may block or reduce GPS signal reception.

Updates for this device are delivered via the internet. This page provides information on compatibility with current devices such as PCs, laptops, Macs, and smartphones. Under the Consumer Contract Regulations, you have 14 days from receipt of purchase to verify compatibility with your internet-connected device. Please note that if you later replace or upgrade your PC, Mac, or smartphone, neither ActiveGPS nor the manufacturer can guarantee compatibility with the new operating system.

Why Buy from ActiveGPS?

We are official authorised Garmin Internet Retailers, offering genuine Garmin products, accessories, and maps. All our stock is purchased directly from assigned Garmin UK distributors - we do not source from the grey market and never sell counterfeit products.

When you buy from ActiveGPS.co.uk, you can be confident that you’ll receive full Garmin support and the peace of mind that comes with purchasing authentic, reliable products.

Page updated: 2nd January 2026