As the previous responders have said your existing navigation system is receive-only and won't do tracking.
As to AirTags.... An AirTag is NOT a true tracker but it fakes it VERY well. AirTags take advantage of the fact that a large percentage of the population has iPhones on their belt or in their pocket. Each and every iPhone has a GPS tracker in it that can instantly phone home over the cellular data connection that it's owner pays for monthly.
Every tag has a unique serial number. All the AirTag does is trigger a nearby iPhone to phone home and pass a message containing the serial number and the current location (the latitude and longitude) of the iPhone. The owner of the phone has no idea that his phone is used as a proxy by each and every AirTag he walks by. Those frequent updates are what causes the dot on the map to "move". This function is part of the iPhone internal programming and does not require the iPhone owner to install an app.
The "Find My" app translates the serial number to whatever name you've assigned to the Tag and that name appears as a dot on the map.
Recently my wife and I took a long trip and we had an AirTag stashed in each piece of luggage. We were able to watch the luggage getting loaded on the airplane, and then after landing we watched them make it to the luggage carousel courtesy of the frequent anonymous proxy updates.
Now as to your need: There are several low-cost trackers out there. Every one that I've found requires a subscription fee... monthly, quarterly, yearly, whatever. It's the old "buy the cheap razor, we'll make the money on the blades" marketing method.
An acquaintance has the 12 volt version of this: $29 purchase plus $7 a month for service.
https: // www.amazon.com/stores/Trak-4/page/705032FD-DC8D-4B75-A5F2-186110B21197
If the insurance discount is more than the $84 a year service charge then it may be worth spending the $29 (plus shipping, which might be free).
Just connect the tracker to the house battery (before the disconnect switch so it's always live) and position it where it has an unobstructed view of the sky... perhaps directly under the dash where it can "see" through the windshield? Or inside a rooftop air conditioner shell? (the unit is NOT waterproof, so make sure it doesn't get rained on)