Will we lose maintenance history if we change PMS?
Not if you export before you give notice. Take a full export of the equipment register, job history, running hours, certificates and attachments while your licence is still active, and store it in the new system's evidence library. History that only exists inside a system you no longer pay for is history you have lost.
How long should we run both systems in parallel?
One full maintenance cycle, normally a month, and at least one complete voyage leg per pilot vessel. Retire the old system only after an internal audit dry run has been answered entirely from the new one.
What about running hours and the survey cycle?
Running hours must be carried across on a single agreed cut-off date and time, recorded in the changeover note. Class continuous machinery survey items should be re-linked to equipment in the new system and verified against the class survey status report before switch-off.
What contractual traps exist when leaving a maritime software vendor?
Auto-renewal windows that require notice months in advance, data export charged as a professional-services project, attachments excluded from the export, and support withdrawn the day notice is served. Check all four before you start the evaluation, not after.