That’s not my pic above lol. I was going to put heaters in the box but isn’t much need as mine are fully insulated and the heater wouldn’t come on as doesn’t drop cold enough in there. This is mine they are brick n block then 50mm polystrene backed with foil bubble wrap cavity insulation boards. Then lined with waterproof caberdek floor boarding.
Don’t sound very clever to me, I use Garmin and it never has no funny signal. That 30 secs could be very frustrating when in some situations, il stick with the Garmin.
You know what they say about buying cheap shit ?