You discovered part 1 of hint number #2!

Signal Peak is key important but its not about him rather then his brother. There are a couple signal peaks, you might overthink it. 

You don´t need part 2 of hint #2, but solving it can verify the height,..+824 obviously gotta do something before being able to see the correct height, + is just the last part.

Its interesting to watch in which regions people think the mountain is located at, might be worth to take a look at nembex with the receiving address.