Garmin Astro 320 vs 430: An In-Depth Comparison Guide

February 11, 2024

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Choosing between the Garmin Astro 320 vs 430 GPS dog trackers? This comprehensive comparison guide will help you decide which model is right for your needs.


Keeping track of your dog’s location and movements during hunting trips, long hikes, or other outdoor adventures is crucial. The Garmin Astro series offers top-of-the-line GPS tracking functionality to monitor your pup’s whereabouts in real time.

The Astro 320 and 430 models have many similarities but also key differences in features, specs, and price. Read on for an in-depth comparison of Garmin Astro 320 vs 430 covering everything you need to make an informed purchase decision.

Overview and Key Features

The Garmin Astro 320 and 430 are handheld GPS systems designed for sporting and hunting dogs. They allow you to track your dog’s movements, view location data, and see their position on a map.

Both models provide:

  • Real-time GPS location tracking
  • Mapping capabilities
  • Dog tracking compass
  • Dog status indicators
  • 2.5 second update rate

Some key advantages of the Astro 430 over the 320:

  • Supports up to 20 dogs vs 10 dogs
  • Preloaded TOPO U.S. 100K maps
  • Geofencing capabilities
  • “Treed” and “On Point” notifications
  • Rechargeable and AA battery options

The 430 model has more advanced features and specs overall. But the 320 remains a highly capable tracker, especially for smaller packs.

Detailed Feature Comparison

Let’s take a closer look at how the Garmin Astro 320 and 430 compare across some key factors:

Tracking Capacity

  • Astro 320: Can track up to 10 dogs from one handheld device. Good for smaller hunting packs. See this Garmin Astro 320 review for more details.
  • Astro 430: Expanded capacity to track up to 20 dogs from one handheld. Ideal for larger packs.

Mapping & Navigation

  • Astro 320: Comes preloaded with a basic worldwide basemap. Optional TOPO 24K and BirdsEye Satellite map add-ons available.
  • Astro 430: Has preloaded TOPO U.S. 100K maps with land data and terrestrial details. Includes 1-year free BirdsEye Satellite Imagery subscription. More advanced built-in mapping capabilities. See this Garmin Astro 430 review for more on the mapping features.
Garmin Astro 430 User Interface

Location Updates

  • Both: Provide location updates every 2.5 seconds when tracking dogs. Fast refresh rate ideal for hunting and field use.
Garmin Astro 320 1

Battery Life

  • Astro 320: Runs on just 2 AA batteries (not included). No rechargeable battery option. Typical battery life around 20 hours.
Garmin Astro 320 Battery
Garmin Astro 320
  • Astro 430: Takes either rechargeable NiMH battery pack (optional) or 2 AA batteries. Rechargeable pack extends time between charges.
Garmin Astro 430 Battery
Garmin Astro 430


  • Astro 320: 1.7 GB of internal memory.
  • Astro 430: 4 GB of internal memory for more data storage.

Water Rating

  • Both: Have IPX7 water rating making them waterproof in up to 1m of water for 30 minutes. Rugged and durable.

Size & Weight

  • Both: Identical compact size of 2.4″ x 6.3″ x 1.4″. Weigh 9.2 oz including batteries. Easy to carry all day.
Garmin Astro 320 Design

Supported Collars

  • Both: Compatible with Garmin T5 or T5 Mini tracking collars. Also work with TT15 collar but without training functions.
T5 Dog Tracking Collar

Advanced Features

The Garmin Astro 430 includes several advanced capabilities the 320 does not:

  • Geofencing to mark safe zones and get alerts when dogs leave
  • “On Point” and “Treed” notifications
  • Integration with Garmin DriveTrack 70 dog GPS navigator
  • Higher 4GB memory compared to 1.7GB on the 320


  • Astro 320: Typically around $450 for the handheld device only.
  • Astro 430: Around $650 for the handheld. More expensive but offers upgraded features.

Both models require buying a compatible dog collar/tracker separately. Overall, expect to spend $200-$300 more for a full 430 system over the 320.

Garmin Astro 320 Review

Garmin Astro 320

The Garmin Astro 320 remains a highly capable GPS dog tracker despite being the older model. Let’s review some of its key strengths and weaknesses.

Astro 320 Pros

  • Accurate GPS tracking up to 10 dogs
  • Location updates every 5 seconds
  • Rugged, waterproof design
  • Easy to use mapping capabilities
  • Long 20+ hour battery life
  • Works with Garmin T5, T5 Mini collars
  • Allows dog names, positions, directions on display
  • Provides statistics like distance traveled
  • No monthly subscription fees

Astro 320 Cons

  • Limited to only 10 dogs
  • No onboard training capabilities
  • Less detailed basemaps
  • No geofencing features
  • AA batteries only, no rechargeable option
  • Fewer advanced capabilities than 430

The Astro 320 is a solid mid-range pick for hunters and dog owners who don’t require the extra features and higher capacity of the 430. It provides accurate real-time tracking of up to 10 dogs at distances up to 9 miles away.

Easy to use, rugged, and highly portable, the 320 remains a go-to choice for hunters with smaller packs. The lack of rechargeable batteries is a downside, but overall it delivers excellent core tracking performance.

Garmin Astro 430 Review

Garmin Astro 430 T 5

The Garmin Astro 430 is the newer, upgraded model in the series. It offers advanced features, expanded capacity, and improved mapping capabilities.

Astro 430 Pros

  • Tracks up to 20 dogs from one handheld
  • Preloaded TOPO 100K maps with land data
  • Includes 1-year free BirdsEye Satellite subscription
  • “Treed” and “On Point” activity notifications
  • Geofence marking of safe zones
  • Rechargeable battery option for longer runtime
  • Higher 4GB memory for more data storage
  • Integrates with Garmin DriveTrack 70 dog GPS navigator

Astro 430 Cons

  • More expensive than the 320 model
  • Collars and batteries sold separately
  • Overkill for smaller packs

With the ability to track a pack of up to 20 dogs, improved TOPO mapping, and helpful alerts when dogs are on-point or treed, the Garmin Astro 430 is ideal for hunters with larger packs.

It offers advanced features both in the field and back at camp. The rechargeable battery, increased memory, and satalite image subscription add even more utility.

For large hunting parties or those who benefit from the newest tracking capabilities, the Astro 430 represents a worthwhile upgrade over the 320 model.

Shop Garmin Astro 430/T 5 on Amazon

Garmin Astro 320 vs 430: Verdict

When choosing between the Garmin Astro 320 and the 430, consider:

  • Number of dogs – Astro 430 better for larger packs of 10+ dogs. See this Garmin vs Sportdog comparison for other large pack options.
  • Mapping needs – Astro 430 has more advanced onboard maps.
  • Battery life – Astro 430 offers rechargeable battery option
  • Advanced features – Astro 430 includes helpful alerts and integrations
  • Price – Astro 320 is more affordable for tighter budgets

For most hunters:

  • The Astro 320 is ideal for tracking up to 10 dogs and provides excellent basic performance at a better price point.
  • The Astro 430 is worth the upgrade for larger hunting parties to take advantage of its expanded capacity, mapping capabilities, and advanced features.

Both models allow you to monitor and track your dogs’ movements during the hunt. The Astro 430 simply offers greater scalability and functionality to satisfy demanding users.


How accurate are the Garmin Astro 320 and 430 models?

Both systems use GPS and GLONASS satellites to provide location accuracy within about 10-15 feet. Accuracy depends on satellite connectivity but these devices provide reliable tracking in most environments.

What kinds of maps does each model use?

The Astro 320 has a basic worldwide basemap. The Astro 430 has more advanced preloaded TOPO U.S. 100K maps with land data and terrain contours. It also includes 1-year free BirdsEye Satellite Imagery.

Can I use the Astro 320 or 430 as a training collar?

No, these models are tracking-only systems. They are designed to work with Garmin’s T5 tracking collars. For training collars, consider a system like the Garmin Alpha 100 which supports bark limiter, stimulation, and other training features via compatible collars.

What batteries do the Astro 320 and 430 take?

The Astro 320 requires 2 AA batteries to operate. The Astro 430 can work with either 2 AA batteries or an optional rechargeable battery pack.

What is the difference in remote control range?

Both systems provide up to 9 miles of range between the handheld and dog collar with the long range T5 antenna. The T5 Mini antenna provides a 4 mile range. Range varies based on terrain and obstacles.

Can I see turn-by-turn directions to my dog?

Yes, when coupled with an optional City Navigator NT map, both systems can provide turn-by-turn road navigation to your dog’s location when you are in your vehicle.

The Bottom Line

When choosing a Garmin Astro tracker, think about your specific needs:

  • The Astro 320 offers excellent performance for small-to-medium size packs at a better price point.
  • The Astro 430 is ideal for larger hunting parties that benefit from expanded capacity, enhanced maps, helpful field alerts, and advanced integration.

Both models allow you to monitor and command your dogs remotely during hunts and outdoor adventures. If you need premium tracking of a large number of dogs, the Astro 430 is likely worth the extra investment over the 320.

But the Garmin Astro 320 remains a highly capable tracker in its own right perfect for most hunting and sporting dog owners.