Head to Your Computer
Well, you can’t do it from the field unless you have a laptop. You cannot remove found caches directly from your GPS unit. You must plug the Oregon 450t GPS unit into your computer to do this. While this is a pain, it’s the only way to remove caches from your GPS device.
To remove a cache, plug your Garmin GPS unit into your computer via the USB cord that you received with your Garmin package. Place your GPS unit into Mass Storage mode. Then, follow these steps:
1. Go to the My Computer icon, and double-click it.
2. Navigate to the “Devices with Removable Storage" or “Devices" depending on your computer. Find your Garmin Oregon 450t device, and double-click it.
3. Open up the GPX folder.
4. Scroll through the list and find the geocache that you want to remove. All of the caches are listed by their numerical geocache code. So, if can’t remember the code of the cache that you want to delete, you’re going to have to figure out this before you go into the folder.
5. Right-click on the geocache that you want to remove, and hit the Delete option from the dropdown menu.