DIY Device

Hi all,
Getting back into sailing after a 10 year break I was in need of a new GPS device. I was wanting a Mini Motion but it seems they are not available these days.
Therefore, I began to wonder about other options. I'd never considered a DIY option, but after reading about the fantastic results in the "Another DIY GPS logger approach" topic I was inspired.
However, I wanted to see if there was a way to achieve it using 'plug and play' components. With that in mind I began researching available items and this is where I've got to:
1. 25hz (switch able to 10hz) GNSS data logger with Bluetooth connectivity for control (via app)
2. Power source (rechargeable) usb-c charging and usb-a power delivery
3. Wireless charging capability usb-c charging connection
4. Waterproof housing
5. Power cables
The pictures below show the items purchased so far to build a unit based around the Racebox Micro as a proof of concept model.
Next steps are to connect all the items and get it running, before testing on the water. If proven, then I will look to refine/reduce the housing.

Great stuff, love the initiative!
However to use it for GPSTC purposes, you'll need to get it approved. I suggest you start that process as soon as you have the prototype working.

Whilst it is possible to gain approval for home made devices, it is not a straight forward process.
I believe GPSTC admin will only want to look at approving a final completed and published design. The way in which the components are assembled has an impact on the antenna reception. Then you will need to submit several files of actual sailing sessions comparing your device against at least one approved device. Even then there is no guarantee of approval.
There is no defined level of accuracy that your device must reach. The tracks are manually analyzed by several technical people on the GPSTC Advisory panel. They are looking for clean data (Low error values), free of spikes and/or missing points.
It is an interesting project to build your own device (I have built two), but if you want an approved device the easy route is to buy a Garmin watch.