Marine
Use a reserve to acknowledge uncertainty, not to hide an incomplete quote. List every unpriced item before deciding what you can afford.
Start with the complete job
Write the result you want from the refit in plain language. That might be a readable helm display with existing instruments retained, rather than an unspecified electronics upgrade. Ask the installer to translate that goal into a list of supplied equipment and work.
Divide the list into equipment, labour, installation parts, access costs and commissioning. This is the structure of our budget planner. It helps prevent a screen-only price being mistaken for the cost of a working installation.
Distinguish unknown from zero
A blank installation price means the work has not been priced. It does not mean installation is free. Mark each figure as a quote or an allowance, and record which items need inspection before a supplier can confirm them.
An explicit zero belongs only against work that genuinely adds no cost. For example, an included handover may be recorded as zero in a separate cost column once you have confirmed it is included elsewhere. Keep that explanation with the quote.
Choose a reserve for the uncertainty
Ask the installer which surprises are plausible on this boat: access problems, old wiring or a mounting panel that needs work. Request a way to approve changes before extra work proceeds. The reserve should reflect those unknowns and your ability to accommodate them.
Our calculator starts with an editable example percentage. It is not a recommendation for every project. A surveyed, tightly scoped installation and a partly dismantled older boat can have very different uncertainties; a single percentage cannot assess those differences.
Keep optional upgrades outside the essential total
Price the work needed to meet the brief first, then list optional additions separately. This gives you a meaningful stopping point if the project approaches your spending limit. It also lets you discuss whether later additions would duplicate labour.
As an illustrative exercise, compare a working replacement with a larger system using the same cost categories. Download both budgets and ask the supplier to explain the differences. Update the figures as allowances become firm quotes instead of treating the first draft as a commitment.
Your planning checklist
Turn the lesson into a useful brief.
Tick what you have gathered. Add your boat details and questions, then save a copy to take to a supplier.
Notes stay in this page and are not submitted. Download before leaving; this page does not save them.
Buying questions, answered
Is 10% always enough contingency?
No. The tool uses it only as an editable example. Discuss the actual uncertainty with the installer and choose your own allowance.
Should optional upgrades use up the reserve?
Keep optional purchases separate from money set aside for uncertainties in the agreed job, so the trade-off remains visible.
Sources & further reading
Original MarineBrands buying and planning guidance, informed by these manufacturer and official references. Confirm current specifications for the exact model and Australian version.
- Raymarine · model-specific manuals and installation documents ↗
- Raymarine Australia · SeaTalk NG and NMEA 2000 ↗
This is an editorial guide. Linked brand advertorials are identified separately; no paid sponsorship or manufacturer approval of this guide is claimed.
