I dont know what Garmin you have but I have 4 Garmin units and Tesla is not even close to even the most basic functions.
I have owned many Garmin products (e.g. Nuvi 770, Nuvi 3790T, Edge 500, Edge 800, etc.) but my latest automotive one is the Nuvi 2589LMT. I agree that their UI is simple, elegant and very effective. IMHO the Garmin Navigation is currently only slightly better than the built-in Tesla solution.
However, the Tesla solution is better is some regards:
- *much* bigger display make it easier to see
- display is more responsive (eg. pinch to zoom, scrolling, etc.)
- Google like search provides better search results when finding locations, especially names of businesses/places
- Tesla recalculates routes instantly, compared to the Garmin products taking 5-10 seconds (depending on complexity)
- I find the maps are updated (automatically) more often than Garmin's manually available updates every 3-4 months
- Tesla voice navigation sounds more natural than Garmin's
- Bluetooth phone connectivity is horrendous in Garmin products, Tesla works much better
Over time I've been getting used to the Tesla UI and I'm nearly at the point where I find the Garmin solution less desirable. And I expect that Tesla navigation will continue to improve over time.