I feel your pain. I'm so sorry.
You have one thing wrong. The compass calibration has nothing to do with the home point. The RTH is done via GPS. Compass calibration is needed only when you are flying from a new location. Some do it before every flight and it doesn't hurt anything.
What happened sounds like a low battery problem as the Phantom will then descend and land wherever it is when it reaches that point.
All is not lost. If you haven't done it already, it may be too late, but try it anyway. First, remove the battery. I hope you did that. Then rinse everything several times with fresh water. Do this to the battery too. Get water up into the vents, near the top of the battery.
Then, get all the water out of the battery and your bird. Use paper towels to get as much water off of printed circuit boards, etc. Get a bunch of rice and fill the inside of your Phantom with it, get a big trash bag and immerse the Phantom and battery in a bag full of a heck of a lot of rice! Tie the top of the bag. This way the rice will absorb the humidity in the bag and not from the outside air.
I have saved many electronic items this way. Including a Phantom battery, iphone, etc. I don't know what you have done since the dunking. Time is a factor. But, do this anyway if you haven't done anything yet.
If you can't get it working again, instead of trashing it, try the classifieds here.
Wishing you luck.
You have one thing wrong. The compass calibration has nothing to do with the home point. The RTH is done via GPS. Compass calibration is needed only when you are flying from a new location. Some do it before every flight and it doesn't hurt anything.
What happened sounds like a low battery problem as the Phantom will then descend and land wherever it is when it reaches that point.
All is not lost. If you haven't done it already, it may be too late, but try it anyway. First, remove the battery. I hope you did that. Then rinse everything several times with fresh water. Do this to the battery too. Get water up into the vents, near the top of the battery.
Then, get all the water out of the battery and your bird. Use paper towels to get as much water off of printed circuit boards, etc. Get a bunch of rice and fill the inside of your Phantom with it, get a big trash bag and immerse the Phantom and battery in a bag full of a heck of a lot of rice! Tie the top of the bag. This way the rice will absorb the humidity in the bag and not from the outside air.
I have saved many electronic items this way. Including a Phantom battery, iphone, etc. I don't know what you have done since the dunking. Time is a factor. But, do this anyway if you haven't done anything yet.
If you can't get it working again, instead of trashing it, try the classifieds here.
Wishing you luck.