Prazi innovative accessories make photography easier, more fun and more creative!

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GPS Unit 2nd Generation

Extended Warranty Program

How it works:Share a post featuring photos or videos of our product on social media or forums (such as YouTube, Facebook, X, or DPReview). Provide your order details and the link to your post; once verified, your warranty will be extended to 2 years.

Frequently Asked Questions

Q: When is IOS version of Photography Assistant coming out? -
The Photography Assistant functions quite differently from standard apps, as it requires continuous background location tracking and persistent Bluetooth communication. Given Apple’s increasingly strict control over these background permissions, ensuring long-term stability for a third-party app across different iOS versions has become nearly impossible. This technical reality is exactly why we prioritized a hardware-based approach from the very beginning. By opting for a dedicated hardware solution instead of relying on an iOS app, we are able to provide the consistent and reliable GPS data collection that photographers require, which simply cannot be guaranteed through software alone. Currently, we have suspended any further development on the iOS version to focus on the reliability that only our hardware can offer.
Q: I’m in the UK; where can I buy the GPS unit for a Z8, please? +
Q: Does the GPS unit work with the Bluetooth in the Nikon Z-50ii and Z-5ii without using your S-adaptor? +
Q: I plan to go out into the wild with 4 Nikon D850s. If I put a receiver on all 4 cameras at the same time do I only need one transmitter to send the GPS coordinates? This will only work if all the receivers use the same frequency. +
Q: I want to use this GPS with a Nikon D850. In addition to recording co-ordinates on each photo, can co-ordinates be quickly viewed while in the field? +
Q: Hello. I am interested on Prize for Nikon z8. Can you ship it to Germany? +
Q: The Prazi GPS uses a lithium-ion battery; although I assume it has a long lifetime, I'd like to know how difficult it would be to replace the battery sometime in the future. I'm familiar with doing this kind of thing with various consumer products, including soldering if needed. +
Q: I just learned about your GPS product. A question: I use an L-bracket on my Nikon Z6III. How can I determine if your Bluetooth BLE adapter will fit my camera with the L-bracket attached? +
Q: The documentation talks about a mobile app. But I could not find one in the iPhone App Store. Is an iPhone app available? +
Q: Which of your products work with the Nikon Z6iii? +
Q: I am interested in the Prazi GPS Unit with BLE Wireless Smart Remote for Nikon Z8 (R-type adapter) -- but I cannot discover where to buy it. +
Q: I purchased a Prazi GPS and received a type S-Adapter. I need the type R Adapter for the Nikon D4s camera. Is it possible to buy the individual connector? Thank you. +

Background Knowledge

1. Exif

Digital photos exist as digital files containing image information and other data. Exif (Exchangeable Image File) is a standard for digital camera image files developed by the Japan Electronic Industry Development Association (JEIDA). Due to the global leadership of Japanese digital cameras, this standard has become a de facto global industry standard, adopted by all digital camera manufacturers, cell phone manufacturers, and related software developers. Exif not only specifies the recording method for digital images but also records useful information such as equipment model, lens specifications,shooting time, exposure parameters, and location information in standard tags. The term Exif now often refers to this embedded information in photos.

2. Bluetooth BLE

Bluetooth is a short-range wireless communication technology for data and voice communication. It is based on low-cost, short-range wireless connections, creating a communication environ ment for fixed and mobile devices. With the development of portable and wearable electronic products, new requirements for short-range wireless communication have emerged, leading to the development of Bluetooth Low Energy (BLE). BLE's main feature is its extremely low power consumption while maintaining strong functionalityCertainly! BLE is not compatible with traditional Bluetooth and has its own technical standards. In the field of photography equipment, traditional wireless remotes and synchronizers often use custom 2.4G wireless technology, which has high power consumption, poor universality, and insufficient connection reliability and customizability. By adopting BLE technology, power consumption isgreatly reduced, extending the battery life of cameras and accessories.
BLE also offers more flexible and open pairing, improved anti-interference capabilities, and device interchangeability, enabling seamless integration with computers, smartphones, smartwatches, and more.

3. Cold Start and Hot Start

GPS positioning relies on satellite signals. Once satellites are locked, their positions and other operational parameters are recorded as ephemeris data. This data is valid for a few hours. If the GPS device is turned off briefly and then back on, it can quickly lock onto satellites using the saved ephemeris data, known as a hot start. Conversely, if the device is off for an extended period or moved a significant distance, the ephemeris data becomes invalid, requiring a cold start. Cold start time depends on the environment; in open areas with strong satellite signals, it is shortest, while in obstructed environments, it may take longer or fail to lock onto satellites. Ourdevice's cold start time in open environments is approximately 24 seconds, making it one of the top-performing consumer GPS receivers.

4. WGS-84 Coordinate System

GPS positioning results are expressed as longitude, latitude, and altitude, but these data differ conceptually from traditional geographic information. Traditional geographic information is based on astronomical measurements with significant positional errors. A digital model of the Earth was developed for the GPS system, using the Earth's center of mass as the origin and a reference ellipsoid as the base shape. This model provides a precise, measurable coordinate description for every point relative to the Earth's center of mass. GPS positioning systems operate based on this coordinate system, accurately determining the receiver's location.

5. UTC Time

UTC (Universal Time Coordinated) is a global standard time that does not change with time zones. It allows satellite positioning systems to operate globally. UTC time is close to Greenwich Mean Time but differs in definition, acquisition, and value by a few seconds. Digital camera with GPS devices record three times in Exif data of the photo: shooting time, file time, and UTC time. The first two come from the camera's system settings, while UTC time comes from satellites. These times are related but independent. When using a mobile app for positioning, the recorded UTC time is replaced by the phone's system time, which is for reference only.

6. Static Drift

Satellites providing positioning signals orbit over 20,000 kilometers above the Earth. GPS devices determine their location based on the time difference of signals from different satellites. Even when stationary, the calculated position data fluctuates due to various errors or interferences, especially during the initial seconds after a cold start or when fewer satellites are locked. This phenomenon is known as static drift. In our device, it may initially show successful positioning, but the camera may not see the location due to large positioning errors. Static drift can be eliminated by waiting a moment or moving slowly. Satellite positioning systems improve accuracy during continuous movement by predicting direction and distance, calibrating positioning information based on data changes at different points. Positioning accuracy may decrease if standing still.