1)
Why is he happy?
1.
Rashi: Hashem made Shamayim va'Aretz, and the sea (6). Everything is His. All is His, so He can guard him on the sea and on the land. Nochri kings, even if they can guard on the land, they cannot guard at sea.
2)
Why does it mention "Kel Yakov"?
1.
Rashi: Hashem promised to him "Hine Anochi Imach u'Shmarticha
1
Tanchuma: We learn from "Kum His'halech ba'Aretz l'Arkah ul'Rachbah" (Bereishis 13:17. It is normal to plow lengthwise and widthwise - PF.)
3)
What does "Sivro Al Hashem Elokav" add?
1.
Radak: The matter is repeated in different words.
