It depends a lot on what the goods were, where they were going, etc. A lot of voyages were speculative and instead of wages, the crew would get a proportion of the profits from the voyage. How big a share you got was determined by your rank. So, you would sign on to sail to Goa and pick up spices. You'd go down and hopefully not die, then come back, or jump ship if there was a more lucrative looking offer, and sail back. When your cargo of spices are sold, it's accounted for and you're given an allotment commiserate with your rank and whether and for the length you spent on the ship during that voyage.

The other poster mentioned advances. Those became more essential and expected over time. Sailors needed money to support their families while they were gone if they had one. They had to settle debts. Etc.

Also, some things we don't count as wages were considered wages back then. The most important was the food and beer rations. Nicer food/beer was seen as a better wage. They also had the opportunity to pick up some rare goods to take back and sale on their own.

Also, if the vessel had passengers, the crew had opportunities to earn tips to supplement their wages.

There's a scholar named Lewis Fischer who did a lot of work on this topic. He's got a couple books out and if you've got JSTOR you can find papers.