Remove the standard (non electronic) key from the fob and tuck it under my wetsuit on one of my wrists.
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You can get a valet key from the dealer.
No electronics.
For boat diving, just have a small otter box in mesh dive bag pocket for key, some cash, CC-Card, multi tool, coupla O-rings, cigar and lighter, etc.
The primary problem is not finding a place to secure your keys but what you do after the dive. If key had been in salt water and the key was immediately placed into the lock after a few dives the vehicle lock would become increasingly difficult to open due to internal corrosion and with the passage of time totally inoperable.
Therefore, after a dive wash the key to remove any traces of salt water or fresh water dampness . Best is the simplest, just place in your key in your mouth for a while, then air dry or as so many did have an old piece of dry cloth to wipe the key totally dry.
After that the key maybe used with out corrosion to the internal locking mechanism.
Hope this helps,
SDM
Hopefully we can. One of our two cars only has electronic keys, and since it does not have a lockable glove compartment or separate trunk, it doesn't have a valet key. We'll have to call the dealer and find out.
The car with a valet key is too small to carry tanks.