The estimated budget for this opportunity is between $500,000 and $1,500,000. This estimate is based on the daily vessel rate, which is not specified in the document, but considering the scope of work and the requirements for the vessel, it is likely to be in the range of $5,000 to $15,000 per day. With a total of 15-18 days of survey work per year, and a contract period of 3 years, the total budget would be approximately $225,000 to $675,000 per year, or $675,000 to $2,025,000 over the 3-year period. However, considering the additional costs for equipment, materials, and labor, the total budget is likely to be higher, resulting in an estimated range of $500,000 to $1,500,000.