Sure!  Here are some other ideas for items that could retain marker information after a time loop in your game:

5. A book that allows the player to take notes and mark locations of interest which remain after the loop.
6. A bracelet that remembers what gear you were wearing, and marks where you can go pick them up again after the time loop.
7. A shield that marks the location of the last NPC which hit the player on future loops.
8. A bowl that marks the location of food items or ingredients the player can harvest.
9. A horn that marks the location of the same horse it has previously been attuned to on other loops.
10. A coin purse that marks areas where the player has previously obtained a lot of money.

I hope this is helpful in designing your game!
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