Fundamentally the two types of surveys are the same they give the purchaser and lender a drawing of where property lines, improvements, building violations in relation to its neighbors and property boarders. But, the two surveys are very different when it comes to obtaining a mortgage and title insurance.
A Location Drawing - Shows the property lines and locates any and all improvements on the lot, using the legal description and any recorded easements, right of ways, etc. A location drawing is accurate up to one foot in each direction. A location drawing is not based on markers at the property.
Boundary Survey - Is done by a crew of surveyors "in the field", new markers are located at the property, and lines are determined where they actually are, not by the recorded plat but checked against it. There is little to no margin of error on a boundary survey.
The other main difference is the cost of the two surveys. Most location drawings will vary between $250 - $400 (up to 1 acre) depending on the surveying company being used. For properties over 1 acre the title company will get quotes for the location drawings. A boundary survey is quite a bit more expensive because of the amount of time, man power and how accurate the boundary survey must be. All boundary surveys will quoted but the range for 1 acre or under could be anywhere between $700 - $1500.
When it comes to obtaining a mortgage and title insurance when purchasing a new home, a location drawing is primarily the only requirement unless an encroachment or easement has come into question and the title company can not remove the survey exception from the lender's policy. A location drawing is usually not required on a refinance.
When a new purchaser decides to purchase a new property and wants to put improvements on the property things like a shed, fence or a deck it is important to know where you property lines are and where the building set back lines are so that you do not encroach on your neighbors property, or violate a building code which could be costly for the new purchaser if they have to move the shed, fence or take down the newly constructed deck. This is where the benefit of the boundary survey would come into play and where the added expense can really save the homeowner in the long run.