Hi group, saw this post on trackers. I am a Private Investigator and ex DI from a specialist function. I have been doing covert surveillance in the police and as a Private Investigator for eighteen years. I know a bit about trackers because for that length of time, it has been my main tool of the trade. I have tried and tested everything on the market.
The problem is with these things, is that there are a lot of cheap Chinese trackers out there. Also a lot of the tracking firms use devices with an annual fee or where you have to send them back to get the battery changed.
The ones I use are small, not expensive (under £500) and cheap to run. I estimate a boat will cost £1 a week for the SIM costs. There is a battery meter online, so when it's low on battery, I get plenty of warning, plug it in to the mains and 12 hours later, it's fully charged. They are fully waterproof.
Just be careful about buying cheap stuff, you pay a lot more in the long run and will have battery or signal failures.
I just use the best stuff there is. It's a bit like being a mechanic, you don't buy 'Twazzer bargain tools' you buy 'Snap-on.
If you need details, private message me. Good luck, Phil.