Marks: For added damage late game Gankplank with hit like a truck

Seals: For added armor late game because this build isnt like a Tankplank and you are slightly vulnerable in the armor and MR areas

Glyphs: added MR because of lack of defense with Gankplank

Quints: for the added 4.5% move speed Gankplank will be extremely quick plus Raise Morale and very hard to get away from especially with Trinity Force and the Grog Soaked Blade slow effect

Offense: Only 4 into offense because hes already very very hard hitting throughout the game and will be very easy to kill enemy champions with so dont really need Offense masteries

Defense: Gankplank is slightly vulnerable in the defensive area and so most points go into defense to try and support that a little bit

Utility: 3 into utility just for the move speed bonus Gankplank will be a very quick champion

Pros:
Very mobile
Hits like a truck
Gives opponent that is being ganked small amount of time to react
High attack speed
A lot of slows for minimal enemy escape

Cons:
Not very tanky
Vulnerable in armor and MR
vulnerable to CC
doesnt have much CC

Standard Jungle Rotation
Blue-->Red-->Wraiths-->Gankplank
Golems-->Wight-->Wolves-->Wraiths
Gankplank

Elder Lizard for good early damage for quick jungle clear and good gank damage

Boots of Swiftness for high mobility

Ravenous Hydra fast jungle/lane clear time due to aoe damage

Frozen Mallet high source of health to be a bit tankier and an added slow for minimal enemy escape and added attack damage

Statikk Shiv for the chain dmg plus Ravenous Hydra insane clear time with good damage to champions and move speed boost for added mobility

Trinity Force good all around stat booster and added mobility

Spirit Visage increases Remove Scurvey heal and give some MR plus added lifesteal to go with Ravenous Hydra