Quick verdict
The Garmin dēzl OTR620 is the better choice for drivers who want a compact truck GPS. The Garmin dēzl OTR720 is better for drivers who prefer a larger screen.
Both units have the same verified truck navigation and connected features. They support custom truck routing, satellite arrival imagery, truck parking information, and live traffic updates. Both also include map updates and work with the Garmin dēzl smartphone app.
The main differences are screen size, screen resolution, physical dimensions, weight, and battery life.
The OTR620 has a 6-inch screen with a resolution of 1280 × 720 pixels. It is smaller, lighter, and has a higher screen resolution than the OTR720. The OTR720 has a 6.95-inch screen and a longer battery life of up to 1.5 hours.
For most drivers, the choice depends on available cab space and preferred screen size, not navigation features.
Why choose Garmin dēzl OTR620?
Choose the Garmin dēzl OTR620 if you want a smaller GPS that takes up less space in your truck cab.
The OTR620 measures 6.0 × 3.35 × 0.7 inches and weighs 6.2 oz. Its compact body can be useful if you have limited space on your dashboard or windshield. It is also easier to carry and store because of its smaller size and lower weight.
The 6-inch screen has a resolution of 1280 × 720 pixels. This is higher than the 1024 × 600 resolution of the OTR720. The OTR620 also has a higher pixel density, which can make small text and map details look sharper.
You do not lose any of the verified truck navigation features when you choose the smaller model. The OTR620 supports truck dimensions, hazmat routing, bridge height warnings, satellite arrival imagery, and connected services.
Its main disadvantage is the smaller display. The stated battery life is also shorter at 1 hour.
Choose the OTR620 if compact size, lower weight, and higher screen resolution are your priorities.
Why choose Garmin dēzl OTR720?
Choose the Garmin dēzl OTR720 if you want a larger screen for truck navigation.
The OTR720 has a 6.95-inch display, compared with the 6-inch display on the OTR620. The additional screen area can make the map easier to view when you check routes, road junctions, and upcoming turns.
The OTR720 measures 6.97 × 4.17 × 0.75 inches and weighs 8.5 oz. It requires more mounting space than the OTR620. This is an important point if your truck has a small dashboard or limited windshield space.
The OTR720 also has a stated battery life of up to 1.5 hours. This is 30 minutes longer than the OTR620. However, both devices are designed to use vehicle power during normal driving.
The OTR720 has the same verified truck navigation and connected features as the OTR620. There is no verified difference in truck routing functions, map updates, or live services.
Choose the OTR720 if a larger display and slightly longer battery life are more important than compact size.
Garmin dēzl OTR620
A compact 6-inch truck GPS with custom truck routing, high-resolution satellite arrival imagery and Garmin’s connected trucking features.
Garmin dēzl OTR720
A 7-inch dedicated truck GPS with custom truck routing, satellite arrival imagery and connected trucking features.
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Key differences
Battery life
Weight
Screen resolution
Screen size
Full comparison
Rows with different values are highlighted. “Not verified” means TruckerDude has not confirmed that feature from a reliable source; it does not mean the feature is absent.
| Feature | Garmin dēzl OTR620 | Garmin dēzl OTR720 |
|---|---|---|
| Key specifications | ||
| Brand | Garmin | Garmin |
| Device type | Dedicated GPS | Dedicated GPS |
| Built-in dash cam | No | No |
| Release year | 2024 | 2024 |
| Screen size | 6 in | 6.95 in |
| Screen resolution | 1280 x 720 | 1024 x 600 |
| Dimensions | 6.0 × 3.35 × 0.7 in | 6.97 × 4.17 × 0.75 in |
| Weight | 6.2 oz | 8.5 oz |
| Battery life | 1 hour | 1.5 hours |
| Wi-Fi | Yes | Yes |
| Bluetooth | Yes | Yes |
| Connectivity | ||
| Live services connection | Smartphone app | Smartphone app |
| Smartphone app required | Yes | Yes |
| Map updates included | Yes | Yes |
| Truck navigation | ||
| Truck-specific routing | Yes | Yes |
| Truck height input | Yes | Yes |
| Truck weight input | Yes | Yes |
| Truck length input | Yes | Yes |
| Truck width input | Yes | Yes |
| Hazmat support | Yes | Yes |
| Bridge height warnings | Yes | Yes |
| Weight limit warnings | Yes | Yes |
| Steep grade warnings | Yes | Yes |
| Weigh station alerts | Yes | Yes |
| Connected & trucker features | ||
| PrePass support | Yes | Yes |
| CAT Scale | Yes | Yes |
| Truck parking | Yes | Yes |
| Satellite arrival imagery | Yes | Yes |
| Community loading docks | Yes | Yes |
| Live traffic | Yes | Yes |
| Live weather | Yes | Yes |
| Live fuel prices | Yes | Yes |
Final recommendation
We recommend the Garmin dēzl OTR620 for drivers who want a compact GPS with a sharp display. It gives you the same verified navigation features as the larger model in a smaller and lighter device.
The Garmin dēzl OTR720 is our recommendation for drivers who prefer a larger navigation screen. Its additional screen area can make maps easier to view, particularly when the GPS is mounted farther from the driver.
Neither model has a verified advantage in truck-specific routing or connected services. If both models meet your screen and mounting requirements, compare their current prices before you buy.
Both devices can help you plan routes based on your truck dimensions and restrictions. However, GPS information can be incomplete or out of date. Always check road signs, bridge clearances, and local restrictions before you continue on a route.