November 2025 · Observational report, single deployment
Communications capability is routinely classified as a support function in humanitarian medical deployment, distinct from the clinical resources it serves. Observations from CASSM's Hurricane Melissa response indicate that this classification understates the severity of its impact. At the Black River base clinic, the satellite link deployed for external communication was primarily used for intra-site coordination, resolving a queueing constraint at the pharmacy station that no clinical resource could have addressed. This report documents what was deployed, how it was used, and the limitations of the observations themselves.
Operational context
The Hurricane Melissa response constituted CASSM's largest coordinated field deployment to date, 111 volunteers, 35 medical doctors, five buses, a stationary base clinic at Black River, St. Elizabeth, and mobile units serving residents unable to travel for care. The deployment registered 209 patients and distributed 500 care packages.
Operations at this scale generate sustained demand for coordination across several concurrent processes. Under normal conditions, patient progression through registration, triage, and dispensing, medication resupply, team positioning and partner communication are absorbed by the commercial mobile infrastructure and are not treated as planning variables. Post-hurricane conditions in St. Elizabeth invalidated that assumption.
This was CASSM's first deployment incorporating dedicated communications equipment. The account below is observational rather than experimental. No controls were established, no measurements were instrumented, and the findings are drawn from a single deployment across three sites.
Configuration
A single mini Starlink satellite terminal was deployed, paired with a Linksys Velop Pro 6E mesh system to distribute coverage across each site. Terminal placement was determined by elevation, with the unit mounted on top of a tent, a house, or a bus roof as the highest available mounting point at each location.
Power provision differed by site:
- Black River, St. Elizabeth generator power supplied by Don's Motor World, which provided the operational base for the mission.
- Petersfield High School and Seaford Town, Westmoreland a portable solar-powered generating unit, both sites lacking mains supply. The unit operated without fault across both deployments.
Each site operated as a single-day deployment. The Black River configuration comprised eight tent groups arranged according to a designed patient flow, including registration and documentation, triage, doctor's consultation, examination, dressing, emergency, seating and waiting, pharmacy, warm meal distribution, with the team's transportation buses (qty 5) positioned some distance away from the tents but on the site.
Observed use intra-site resupply coordination
With pharmacy infrastructure destroyed across the parish, the availability of medication matched to individual needs generated demand that exceeded the dispensing station's absorptive capacity. The resulting queue made physical departure from the station costly. Trips to the supply bus were suspended otherwise, medical dispensing would be hampered and the pharmacist's availability, rather than stock or distance, emerged as the binding constraint on throughput. Resupply was consequently reorganized around the communications link. The pharmacist transmitted the requirements to the supply bus team, who assembled the specified medications and dispatched a logistics team member to deliver them. Logistics personnel stationed near the pharmacy station also received requests directly, relaying them to the bus on foot or by telephone, depending on which route was faster at the time. The satellite link was therefore carrying traffic across tens of meters within a single site, servicing a coordination requirement generated by queue dynamics rather than by geographic separation.
Observed use unanticipated functions
Two functions emerged that had not been specified in deployment planning.
At all three sites, community and team members accessed the wireless network to contact relatives. Peak concurrent utilization was estimated at 20 to 30 users no measurement was taken, and this figure should be treated as an observer estimate as opposed to data.
At Petersfield High School and Seaford Town, where the solar unit was the only available power source, device charging became a secondary function. Two twelve-outlet extension blocks were available and accessible to all present. Capacity proved insufficient, and clinical practitioners queued behind community users to charge telephones and small-factor medical equipment at sites operating for a full day without mains-supplied electricity.
The second function produced a resource conflict between clinical and community use that had not been anticipated in provisioning and for which no allocation rule existed.
Identified failure-unmet planned requirement
The layout plan governing this deployment specified communication between mobile units and the stationary base for referral, emergency transport, and supply restocking. This requirement was not met. The single terminal remained at the base or field clinic, leaving mobile teams who saw 34 patients, without connectivity for the duration of each excursion. In the event of an emergency requiring escalation, or a case warranting doctor-to-doctor consultation, mobile teams had no reliable channel to the base or to colleagues in Kingston, which was largely unaffected by the hurricane. The failure was not in requirements analysis, which correctly identified the need, but in provisioning against it. Single-terminal deployment constitutes a single point of failure in a distributed operation, and adding a mobile-unit terminal is the primary corrective action for subsequent deployments.
Implications for deployment planning
Post-disaster demand is not uniformly distributed across clinical services. At Black River, it concentrated on dispensing, reflecting the specific access loss the population had sustained. The service absorbing such concentration is also the service least able to release personnel for ancillary tasks, which suggests that communications provision to surge-bearing stations should be treated as a condition of sustained operation rather than as an efficiency measure.
Two further implications follow. First, connectivity requirements are more accurately assessed per operational unit than per mission. A stationary base and a mobile team constitute distinct operations with distinct communication needs, and provisioning for one does not serve the other. Second, power capacity should be dimensioned to the clinical load before community access is provided, rather than allowing clinical and community demand to compete for the same outlets. At both Westmoreland sites, this allocation was settled informally, by order of arrival at the extension blocks, with no rule established in advance.
Limitations and instrumentation requirements
This deployment was not instrumented, and the limitations of the present account follow directly from that. Concurrent user counts, data volume, solar unit runtime under load, charging demand relative to available outlets, and the duration and frequency of pharmacy resupply cycles were all unrecorded. Consequently, no claim can be made regarding whether the deployed configuration was adequately, marginally, or excessively provisioned. The observations establish that the equipment was used and identified where it was insufficient, but does not support quantitative sizing conclusions.
Instrumenting these variables in subsequent deployments would permit equipment specification based on measured demand rather than estimates, and would establish whether communications requirements scale with the number of mobile units or remain fixed. Documentation of field practice was not a design objective of this deployment, however, incorporating it as one is a prerequisite for developing the observations reported here into a validated deployment standard.
See From the Field for the full operational account of the Hurricane Melissa response, and Sizing a field clinic under funding uncertainty for the resourcing model applied to the same deployment.