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Retevis RM20 VHF Marine Radio vs 85mm Boat GPS Speedometer 0-80MPH Car Odometer Gauge 7 Colors Backlight With GPS

Updated August 2026The Retevis RM20 VHF Marine Radio is the superior choice for serious boaters needing communication and safety features, while the 85mm Boat GPS Speedometer is a budget-friendly option for basic speed measurement.

The Retevis RM20 VHF Marine Radio is the superior choice for serious boaters needing communication and safety features, while the 85mm Boat GPS Speedometer is a budget-friendly option for basic speed measurement.

Why Retevis RM20 VHF Marine Radio is better

communication

Retevis RM20 offers DSC distress signaling.

GPS features

Retevis RM20 provides comprehensive GPS navigation.

marine durability

Retevis RM20 is designed specifically for marine environments.

Why 85mm Boat GPS Speedometer 0-80MPH Car Odometer Gauge 7 Colors Backlight With GPS is better

price

85mm speedometer is significantly cheaper.

versatility

85mm speedometer can be used in various vehicles.

color options

85mm speedometer has customizable backlight colors.

Overall score

Retevis RM20 VHF Marine Radio
85
85mm Boat GPS Speedometer 0-80MPH Car Odometer Gauge 7 Colors Backlight With GPS
55

Specifications

SpecRetevis RM20 VHF Marine Radio85mm Boat GPS Speedometer 0-80MPH Car Odometer Gauge 7 Colors Backlight With GPS
BrandRetevisPiousunt
CommunicationYesNo
Odometer ResetNoNo
IP RatingIP67IP67
WeightUnknownUnknown

Dimension comparison

Retevis RM20 VHF Marine Radio85mm Boat GPS Speedometer 0-80MPH Car Odometer Gauge 7 Colors Backlight With GPS

Overview of the Retevis RM20 VHF Marine Radio

The Retevis RM20 VHF Marine Radio is a robust communication device designed specifically for maritime use. Priced at £162.99, it offers features that ensure reliable communication and safety on the water. With a loud volume reaching up to 110 dB, it facilitates clear calls even in noisy environments.

This marine radio includes built-in GPS functionality, allowing users to send and receive location information, which is crucial for navigation and emergency situations. Additionally, it is an IP67 waterproof device, meaning it can withstand being submerged in water for up to 30 minutes. This durability, alongside the ability to send distress signals, makes it a vital tool for any boat owner.

Overview of the 85mm Boat GPS Speedometer

The 85mm Boat GPS Speedometer is a versatile instrument available for £40.89, designed to provide accurate speed readings for various vehicles, including boats and cars. Its speed range is from 0 to 80 MPH, suitable for both land and water vehicles.

Constructed with a Stainless Steel 316L bezel and anti-fog glass, this speedometer also boasts an IP67 waterproof and dustproof rating. One of its standout features is the seven solid colour settings for backlighting, allowing users to customise the display to their preferences. However, it’s important to note that the odometer cannot be reset, and it accumulates mileage even when powered off.

Communication Capabilities

When it comes to communication capabilities, the Retevis RM20 VHF Marine Radio excels with its marine-specific features. It is equipped with a DSC (Digital Selective Calling) function, which allows users to send distress signals—a crucial feature for safety at sea. The radio can also transmit and receive calls, ensuring effective communication during emergencies or routine interactions.

In contrast, the 85mm Boat GPS Speedometer does not offer any communication capabilities. Its primary function is to display speed and odometer readings, lacking the emergency features that are vital for maritime safety. Therefore, for users prioritising communication on the water, the Retevis RM20 is the clear choice.

The navigation features of the Retevis RM20 VHF Marine Radio include built-in GPS that provides latitude, longitude, and time information. This functionality is essential for mariners who need to navigate accurately and send their location to others in case of emergencies.

On the other hand, the 85mm Boat GPS Speedometer also includes GPS functionality, but it is focused solely on speed measurement rather than comprehensive navigation. While it helps users understand their speed, it does not provide location details like the marine radio. Thus, for those needing robust navigation support, the Retevis RM20 is significantly more beneficial.

Durability and Build Quality

In terms of durability, both products exhibit a high level of protection against water and dust. The Retevis RM20 is rated IP67, meaning it can survive submersion in water for up to 30 minutes, making it ideal for marine environments where exposure to water is a constant risk. The presence of external speakers also enhances its volume output, making it suitable for use in noisy conditions.

Conversely, the 85mm Boat GPS Speedometer also holds an IP67 rating, ensuring it withstands harsh weather conditions. The stainless steel bezel and anti-fog glass contribute to its durability, making it a reliable choice for those needing a speedometer. However, it lacks the extensive marine-specific protections that the Retevis RM20 offers, which may be a consideration for serious boaters.

Price Comparison

Pricing is a significant factor when considering these two products. The Retevis RM20 VHF Marine Radio is priced at £162.99, reflecting its advanced features and functionalities that cater specifically to marine communication and safety. While this is a higher investment, the features it offers could be life-saving.

In contrast, the 85mm Boat GPS Speedometer is much more affordable at £40.89. This makes it an appealing option for those who need a basic speedometer without the additional features that the marine radio provides. However, the lower price comes with trade-offs in terms of functionality and safety features that are crucial for boating.

Applicability and Use Cases

The Retevis RM20 VHF Marine Radio is specifically designed for maritime use, making it suitable for boaters, sailors, and maritime professionals who require reliable communication and safety features. Its ability to send distress signals and provide GPS information is vital for those operating on open waters.

The 85mm Boat GPS Speedometer, while versatile, is more general in its application. It can be used across various vehicles, including motorcycles, trucks, and cars, in addition to boats. However, for serious boating applications, it lacks the safety and communication features necessary for effective maritime operation, making it less suitable for dedicated sailors.

Which should you buy?

In conclusion, the choice between the Retevis RM20 VHF Marine Radio and the 85mm Boat GPS Speedometer largely depends on your specific needs. If you are a serious boater requiring robust communication capabilities and safety features, the Retevis RM20 is the superior option due to its marine-focused functionalities, including distress signalling and GPS navigation. However, if you are looking for a budget-friendly speed measurement device for various vehicles, the 85mm Boat GPS Speedometer offers solid performance at a significantly lower price. Ultimately, your decision should align with the primary functions you need from your marine electronics.

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Retevis RM20 VHF Marine Radio vs 85mm Boat GPS Speedometer 0-80MPH Car Odometer Gauge 7 Colors Backlight With GPS | versusfinder